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Assistive Listening Devices Assistive listening devices devices can help you hear in certain listening environments. These can include telephone and cell phone amplifying devices, smart phone or tablet "apps," and closed circuit systems (induction coil loops) in places of worship, theaters, and auditoriums. TV listeni...
How is rickets diagnosed? Rickets is typically diagnosed using specific blood tests and x-rays. Blood tests usually show low levels of calcium and phosphorus and high levels of alkaline phosphatase. Bone x-rays may show areas with calcium loss or changes in bone shape. Bone biopsies are rarely performed, but can confir...
The risk of sudden cardiac arrest (SCA) increases: With age If you are a man. Men are more likely than women to have SCA. Some studies show that blacksparticularly those with underlying conditions such as diabetes, high blood pressure, heart failure, and chronic kidney...
In 15 to 40 percent of all cases of classic Paget disease of bone, the disorder has an autosomal dominant pattern of inheritance. Autosomal dominant inheritance means that having one copy of an altered gene in each cell is sufficient to cause the disorder. In the remaining cases, the inheritance pattern of classic Pag...
Many arrhythmias cause no signs or symptoms. When signs or symptoms are present, the most common ones are: Palpitations (feelings that your heart is skipping a beat, fluttering, or beating too hard or fast) A slow heartbeat An irregular heartbeat Feeli...
HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP) is a chronic, progressive disease of the nervous system that affects less than 2 percent of people with HTLV-1 infection. Signs and symptoms vary but may include progressive weakness, stiff muscles, muscle spasms, backache, a 'weak' bladder, and consti...
Today, there are more treatments for urinary incontinence than ever before. The choice of treatment depends on the type of bladder control problem you have, how serious it is, and what best fits your lifestyle. As a general rule, the simplest and safest treatments should be tried first. Treatment may include - bladder ...
The prevalence of progressive external ophthalmoplegia is unknown.
Apraxia (called "dyspraxia" if mild) is a neurological disorder characterized by loss of the ability to execute or carry out skilled movements and gestures, despite having the desire and the physical ability to perform them. Apraxia results from dysfunction of the cerebral hemispheres of the brain, especially the parie...
The National Institute of Neurological Disorders and Stroke (NINDS) conducts research related to MID in its laboratories at the National Institutes of Health (NIH), and also supports additional research through grants to major medical institutions across the country. Much of this research focuses on finding better ways...
Chondrocalcinosis 2 is a rare condition characterized by the accumulation of calcium pyrophosphate dihydrate crystals in and around the joints. A buildup of these crystals can lead to progressive (worsening over time) joint damage. Some affected people may not have any signs or symptoms of the condition. Others experie...
Most cases of 47,XYY syndrome are not inherited. The chromosomal change usually occurs as a random event during the formation of sperm cells. An error in cell division called nondisjunction can result in sperm cells with an extra copy of the Y chromosome. If one of these atypical reproductive cells contributes to the g...
When caused by mutations in the EIF2AK4 gene, PVOD is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptom...
Certain factors affect prognosis (chance of recovery) and treatment options. The prognosis (chance of recovery) and treatment options depend on the following: - The stage of the cancer (the size of the tumor and whether it has spread to the lymph nodes or other parts of the body). - Where the cancer is in t...
The symptoms of Lujo hemorrhagic fever, as described in the five patients in the original cluster outbreak, resemble those of severe Lassa Fever. After an incubation period of 7 to 13 days, the clinical course started by a non-specific febrile illness accompanied by headache and muscle pain. The disea...
Osteoporosis-pseudoglioma syndrome is caused by mutations in the LRP5 gene. This gene provides instructions for making a protein that participates in a chemical signaling pathway that affects the way cells and tissues develop. In particular, the LRP5 protein helps regulate bone mineral density and plays a critical role...
Acute or short-term low back pain generally lasts from a few days to a few weeks. Most acute back pain is the result of trauma to the lower back or a disorder such as arthritis. Pain from trauma may be caused by a sports injury, work around the house or in the garden, or a sudden jolt such as a car accident or other st...
The prognosis is dependent upon the underlying disorder. Some of the disorders that are associated with cerebellar hypoplasia are progressive, which means the condition will worsen over time, and will most likely have a poor prognosis. Other disorders that feature cerebellar hypoplasia are not progressive, such as thos...
Pulmonary hypertension (PH) is high blood pressure in the arteries to your lungs. It is a serious condition. If you have it, the blood vessels that carry blood from your heart to your lungs become hard and narrow. Your heart has to work harder to pump the blood through. Over time, your heart weakens and cannot do its j...
More than 90 percent of all cases of Refsum disease result from mutations in the PHYH gene. The remaining cases are caused by mutations in a gene called PEX7. The signs and symptoms of Refsum disease result from the abnormal buildup of a type of fatty acid called phytanic acid. This substance is obtained from the diet...
These resources address the diagnosis or management of Bartter syndrome: - Genetic Testing Registry: Bartter syndrome antenatal type 1 - Genetic Testing Registry: Bartter syndrome antenatal type 2 - Genetic Testing Registry: Bartter syndrome type 3 - Genetic Testing Registry: Bartter syndrome type 4 - Genetic Test...
To diagnose kidney stones, your doctor will do a physical exam and ask about your medical history. The doctor may ask if you have a family history of kidney stones and about your diet, digestive problems, and other health problems. The doctor may perform urine, blood, and imaging tests to complete the diagnosis. ...
Self-harm refers to a person's harming their own body on purpose. About 1 in 100 people hurts himself or herself in this way. More females hurt themselves than males. A person who self-harms usually does not mean to kill himself or herself. But they are at higher risk of attempting suicide if they do not get help. S...
What are the signs and symptoms of Beardwell syndrome? The Human Phenotype Ontology provides the following list of signs and symptoms for Beardwell syndrome. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Diction...
High blood cholesterol usually has no signs or symptoms. Thus, many people don't know that their cholesterol levels are too high. If you're 20 years old or older, have your cholesterol levels checked at least once every 5 years. Talk with your doctor about how often you should be tested.
Fryns syndrome appears to be inherited in an autosomal recessive pattern, which means both copies of a gene in each cell have mutations. However, no associated gene has been identified. The parents of an individual with an autosomal recessive condition each carry one copy of the altered gene, but they typically do not ...
How might microcephalic osteodysplastic primordial dwarfism type 1 (MOPD1) be treated? At this time there are no specific treatments for MOPD1. Treatment is generally supportive. The prognosis is poor for affected individuals, with most of the reported patients dying within the first year of life.
Mutations in the SLC30A10 gene cause HMDPC. This gene provides instructions for making a protein that transports manganese across cell membranes. Manganese is important for many cellular functions, but large amounts are toxic, particularly to brain and liver cells. The SLC30A10 protein is found in the membranes surroun...
Mutations in the TGFB1 gene cause Camurati-Engelmann disease. The TGFB1 gene provides instructions for producing a protein called transforming growth factor beta-1 (TGF-1). The TGF-1 protein helps control the growth and division (proliferation) of cells, the process by which cells mature to carry out specific functions...
Pontocerebellar hypoplasia type 1 (PCH1) is a genetic condition that affects the development of the brain. Individuals with this condition have an unusually small and underdeveloped cerebellum, which is the part of the brain that coordinates movement. A region of the brain called the pons also fails to develop properly...
Cigarette smoking is the number one cause of lung cancer. Scientists have reported widely on the link between cancer and smoking since the 1960s. Since then, study after study has provided more proof that cigarette smoking is the primary cause of lung cancer. Before cigarette smoking became popular after World War I, d...
Emanuel syndrome is a chromosome disorder that causes problems with physical and intellectual development. Signs and symptoms can vary but may include severe intellectual disability; small head size (microcephaly); failure to thrive; cleft palate or high-arched palate; small jaw (micrognathia); congenital heart defects...
What are the signs and symptoms of Ectrodactyly cleft palate syndrome? The Human Phenotype Ontology provides the following list of signs and symptoms for Ectrodactyly cleft palate syndrome. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use...
What causes sarcoidosis? No one yet knows what causes sarcoidosis. It is thought by most scientists to be a disorder of the immune system, where the body's natural defense system malfunctions. Some physicians believe that sarcoidosis may result from a respiratory infection caused by a virus. Others suspect that exposur...
Palmoplantar keratoderma with deafness is a rare disorder; its prevalence is unknown. At least 10 affected families have been identified.
Behcet's syndrome is a disease that involves vasculitis, which is inflammation of the blood vessels. It causes problems in many parts of the body. The most common symptoms are - Sores in the mouth - Sores on the sex organs - Other skin sores - Swelling of parts of the eye - Pain, swelling and s...
AMACR deficiency is a rare disorder. Its prevalence is unknown. At least 10 cases have been described in the medical literature.
The exact prevalence of Brugada syndrome is unknown, although it is estimated to affect 5 in 10,000 people worldwide. This condition occurs much more frequently in people of Asian ancestry, particularly in Japanese and Southeast Asian populations. Although Brugada syndrome affects both men and women, the condition app...
Mutations in the MCOLN1 gene cause mucolipidosis type IV. This gene provides instructions for making a protein called mucolipin-1. This protein is located in the membranes of lysosomes and endosomes, compartments within the cell that digest and recycle materials. While its function is not completely understood, mucolip...
What are the symptoms of colpocephaly? Colpocephaly is characterized by a small head circumference and in many cases, intellectual disability. Other signs and symptoms may include movement abnormalities, muscle spasms, and seizures. Poor vision, speech and language difficulties, deafness, and chorioretinitis have been ...
How is X-linked hypophosphatemia diagnosed? X-linked hypophosphatemia (XLH) is diagnosed based on clinical observations, biochemical testing, imaging, and family history. Observable signs include low growth rate and noticeable bowing of the legs. X-rays provide more information that can rule out other potential causes ...
Mutations in the SLC25A15 gene cause ornithine translocase deficiency. Ornithine translocase deficiency belongs to a class of genetic diseases called urea cycle disorders. The urea cycle is a sequence of reactions that occurs in liver cells. This cycle processes excess nitrogen, generated when protein is used by the b...
Since newborn screening for this disorder is not available, and early detection is infrequent because the clinical signs of Menkes disease are subtle in the beginning, the disease is rarely treated early enough to make a significant difference. The prognosis for babies with Menkes disease is poor. Most children with Me...
Summary : Electric and magnetic fields (EMFs) are areas of energy that surround electrical devices. Everyday sources of EMFs include - Power lines - Electrical wiring - Microwave ovens - Computers - Cell phones Some people worry about EMF exposure and cancer. Some studies have found a link betwe...
The zoonotic hookworm larvae that cause cutaneous larva migrans (CLM) usually do not survive more than 5 – 6 weeks in the human host. In most patients with CLM, the signs and symptoms resolve without medical treatment. However, treatment may help control symptoms and help prevent secondary bacterial infections. Antipar...
Alport syndrome is a genetic condition characterized by kidney disease, hearing loss, and eye abnormalities. Most affected individuals experience progressive loss of kidney function, usually resulting in end-stage kidney disease. People with Alport syndrome also frequently develop sensorineural hearing loss in late chi...
How is familial isolated hyperparathyroidism inherited? Familial isolated hyperparathyroidism (FIHP) is typically inherited in an autosomal dominant manner. This means that having only one changed (mutated) copy of the responsible gene in each cell is enough to cause signs or symptoms of the condition. When a person wi...
Cluttering is a disorder that affects the way a person speaks. It is characterized by a rapid speaking rate and inability to maintain normally expected sound, syllable, phrase, and pausing patterns while speaking. Other symptoms may include stuttering; language or phonological errors (problems organizing sounds); and a...
What causes malakoplakia? The cause of malakoplakia is unknown, but is thought to be associated with immunodeficiency or autoimmune disorders, such as hypogammaglobinlinemia, therapies that suppress the immune system, cancer, a chronic debilitating disorder, rheumatoid arthritis, and AIDS.
What causes keratoconus? The exact cause of keratoconus is unknown. Both genetic and environmental factors may play a role in the development of keratoconus. The genetic factors involve abnormalities in the structure of collagen, which result in a weak and flexible cornea. Keratoconus is more common in people with Down...
People are not often aware they have gum disease until it is advanced. Any of these symptoms may be a sign of a serious problem and should be checked by a dentist. - bad breath that won't go away - red or swollen gums - tender or bleeding gums - painful chewing - loose teeth - sensitive teeth - receding gums or l...
Achalasia is a disorder of the esophagus, the tube that carries food from the mouth to the stomach. It is characterized by enlargement of the esophagus, impaired ability of the esophagus to push food down toward the stomach (peristalsis), and failure of the ring-shaped muscle at the bottom of the esophagus (the lower e...
The prevalence of TH deficiency is unknown.
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. Most cases result from new mutations in the gene and occur in people with no history of the disorder in their family.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
The prognosis for individuals with Bell's palsy is generally very good. The extent of nerve damage determines the extent of recovery. With or without treatment, most individuals begin to get better within 2 weeks after the initial onset of symptoms and recover some or all facial function within 3 to 6 months.
These resources address the diagnosis or management of Warsaw breakage syndrome: - Centers for Disease Control and Prevention: Hearing Loss in Children - Genetic Testing Registry: Warsaw breakage syndrome - MedlinePlus Encyclopedia: Hearing Loss--Infants These resources from MedlinePlus offer information about the...
Kabuki syndrome occurs in approximately 1 in 32,000 newborns.
Zika is a virus that is spread by mosquitoes. A pregnant mother can pass it to her baby during pregnancy or around the time of birth. A man can spread it to his partner during sexual contact. There have also been reports that the virus has spread through blood transfusions. There have been outbreaks of Zika virus in Af...
The exact prevalence of antiphospholipid syndrome is unknown. This condition is thought to be fairly common, and may be responsible for up to one percent of all thromboses. It is estimated that 20 percent of individuals younger than age 50 who have a stroke have antiphospholipid syndrome. Ten to 15 percent of people wi...
The prevalence of SCA2 is unknown. This condition is estimated to be one of the most common types of spinocerebellar ataxia; however, all types of spinocerebellar ataxia are relatively rare. SCA2 is more common in Cuba, particularly in the Holgun province, where approximately 40 per 100,000 individuals are affected.
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In some cases, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history...
- Dumping syndrome occurs when food, especially sugar, moves too fast from the stomach to the duodenumthe first part of the small intestinein the upper gastrointestinal (GI) tract. - Dumping syndrome has two forms, based on when symptoms occur: - early dumping syndromeoccurs 10 to 30 minutes after a meal - lat...
What are the signs and symptoms of Retinoschisis autosomal dominant? The Human Phenotype Ontology provides the following list of signs and symptoms for Retinoschisis autosomal dominant. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the...
People with 22q11.2 duplication have an extra copy of some genetic material at position q11.2 on chromosome 22. In most cases, this extra genetic material consists of a sequence of about 3 million DNA building blocks (base pairs), also written as 3 megabases (Mb). The 3 Mb duplicated region contains 30 to 40 genes. Fo...
Horner syndrome is usually not inherited and occurs in individuals with no history of the disorder in their family. Acquired Horner syndrome and most cases of congenital Horner syndrome have nongenetic causes. Rarely, congenital Horner syndrome is passed down within a family in a pattern that appears to be autosomal do...
What causes neurofibromatosis type 1? Neurofibromatosis type 1 is caused by changes (mutations) in the NF1 gene. NF1 is a tumor suppressor gene, which means that it encodes a protein that stops cells from growing and dividing too rapidly or in an uncontrolled way. Mutations in NF1 result in an abnormal protein that is ...
Schizencephaly is an extremely rare developmental birth defect characterized by abnormal slits, or clefts, in the cerebral hemispheres of the brain. Babies with clefts in both hemispheres (called bilateral clefts) commonly have developmental delays, delays in speech and language skills, and problems with brain-spinal c...
Keeping the proper level of potassium in the blood is essential. Potassium keeps the heart beating regularly and muscles working right. Problems can occur when blood potassium levels are either too low or too high. Damaged kidneys allow potassium to build up in the blood, causing serious heart problems. Potassium is fo...
Hemolytic anemia can affect people of all ages and races and both sexes. Some types of hemolytic anemia are more likely to occur in certain populations than others. For example, glucose-6-phosphate dehydrogenase (G6PD) deficiency mostly affects males of African or Mediterranean descent. In the United S...
The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes of the National Institutes of Health (NIH) conduct research related to syncope in laboratories at the NIH and support additional research through grants to major medical institutions across the country. Much of this research focuse...
How is Liddle syndrome inherited? Liddle syndrome is inherited in an autosomal dominant manner. This means that only one mutated copy of the disease-causing gene in each cell is sufficient to cause the condition. The mutated copy of the gene may be inherited from an affected parent or occur for the first time in an aff...
Erythema multiforme (EM) refers to a group of hypersensitivity disorders characterized by symmetric red, patchy lesions, primarily on the arms and legs. The cause is unknown, but EM frequently occurs in association with herpes simplex virus, suggesting an immunologic process initiated by the virus. In half of the cases...
People at risk for ARDS have a condition or illness that can directly or indirectly injure their lungs. Direct Lung Injury Conditions that can directly injure the lungs include: Pneumonia. This is an infection in the lungs. Breathing in harmful fumes o...
The National Institute of Neurological Disorders and Stroke (NINDS) has joined with other institutes of the National Institutes of Health (NIH) to form a trans-NIH working group to coordinate and fund research into the disease mechanisms of sarcoidosis, predisposing factors, genetic underpinnings, and the potential for...
These resources address the diagnosis or management of autosomal dominant congenital stationary night blindness: - Genetic Testing Registry: Congenital stationary night blindness These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests -...
The main symptoms of cyclic vomiting syndrome are severe nausea and sudden vomiting lasting hours to days. A person may also experience one or more of the following symptoms: - retching, or making an attempt to vomit - heaving or gagging - lack of appetite - abdominal pain - diarrhea - fever - di...
How might an acanthoma be treated? Acanthomas are considered benign, but treatment may be done for cosmetic reasons or to relieve any associated symptoms. Because acanthomas are quite rare, there are no established guidelines for treatment. Treatment may depend on the type, number, and location of acanthomas. For ex...
Mutations in the FGFR2 gene cause Jackson-Weiss syndrome. This gene provides instructions for making a protein called fibroblast growth factor receptor 2. Among its multiple functions, this protein signals immature cells to become bone cells during embryonic development. A mutation in a specific part of the FGFR2 gene ...
These resources address the diagnosis or management of mycosis fungoides: - Cancer Research UK: Treatments for Cutaneous T-Cell Lymphoma - Genetic Testing Registry: Mycosis fungoides - Lymphoma Research Foundation: Cutaneous T-Cell Lymphoma Treatment Options - National Cancer Institute: Mycosis Fungoides and the Sz...
Mosaic trisomy 9 is a chromosomal abnormality that can affect may parts of the body. In people affected by this condition, some of the body's cells have three copies of chromosome 9 (trisomy), while other cells have the usual two copies of this chromosome. The signs and symptoms vary but may include mild to severe inte...
Larsen syndrome is a disorder that affects the development of bones throughout the body. The signs and symptoms of Larsen syndrome vary widely even within the same family. Affected individuals are usually born with inward- and upward-turning feet (clubfeet) and dislocations of the hips, knees, and elbows. They generall...
Mutations in the WAS gene cause X-linked thrombocytopenia. The WAS gene provides instructions for making a protein called WASP. This protein is found in all blood cells. WASP is involved in relaying signals from the surface of blood cells to the actin cytoskeleton, which is a network of fibers that make up the cell's s...
Kidney disease is often called a "silent" disease, because most people have no symptoms in early kidney disease. In fact, you might feel just fine until your kidneys have almost stopped working. Do NOT wait for symptoms! Blood and urine tests are the only way to check for kidney damage or measure kidney function. (Watc...
The best way to prevent neuropathy is to keep blood glucose levels as close to the normal range as possible. Maintaining safe blood glucose levels protects nerves throughout the body.
A difference in blood type between a pregnant woman and her baby causes Rh incompatibility. The condition occurs if a woman is Rh-negative and her baby is Rh-positive. When you're pregnant, blood from your baby can cross into your bloodstream, especially during delivery. If you're Rh-negative and your ...
The kidneys are two bean-shaped organs, each about the size of a fist. They are located near the middle of the back, just below the rib cage, one on each side of the spine. Every day, the two kidneys process about 200 quarts of blood to filter out about 1 to 2 quarts of urine, composed of waste products and extra water...
Meckel syndrome is a disorder with severe signs and symptoms that affect many parts of the body. The most common features are enlarged kidneys with numerous fluid-filled cysts; an occipital encephalocele, which is a sac-like protrusion of the brain through an opening at the back of the skull; and the presence of extra ...
Is there treatment for Townes-Brocks syndrome? Treatment is directed towards the specific symptoms, including immediate surgical intervention for imperforate anus; surgery for severe malformations of the hands; routine management of congenital heart defects; hemodialysis and possibly kidney transplantation for end-stag...
Von Willebrand disease (VWD) is almost always inherited. "Inherited" means that the disorder is passed from parents to children though genes. You can inherit type 1 or type 2 VWD if only one of your parents passes the gene on to you. You usually inherit type 3 VWD only if both of your parents pass the...
Your skin is your body's largest organ. It covers and protects your body. Your skin - Holds body fluids in, preventing dehydration - Keeps harmful microbes out, preventing infections - Helps you feel things like heat, cold, and pain - Keeps your body temperature even - Makes vitamin D when the sun shi...
Some balance disorders are caused by problems in the inner ear. The part of the inner ear that is responsible for balance is the vestibular system, often refered to as the labyrinth. When the labyrinth becomes infected or swollen -- a condition called labyrinthitis -- it is typically accompanied by vertigo and imbalanc...
Silver syndrome belongs to a group of genetic disorders known as hereditary spastic paraplegias. These disorders are characterized by progressive muscle stiffness (spasticity) and, frequently, development of paralysis of the lower limbs (paraplegia). Hereditary spastic paraplegias are divided into two types: pure and c...
Phaeohyphomycosis refers to fungal infections caused by dematiaceous (darkly, pigmented fungi). It can be associated with a variety of clinical syndromes including invasive sinusitis; nodules or abscesses beneath the skin; keratitis; lung masses; osteomyelitis; mycotic arthritis; endocarditis; brain abscess; and wide-s...
Somatic mutations in the BRAF gene have been identified in the Langerhans cells of about half of individuals with Langerhans cell histiocytosis. Somatic gene mutations are acquired during a person's lifetime and are present only in certain cells. These changes are not inherited. The BRAF gene provides instructions for...
Dyslexia is a brain-based type of learning disability that specifically impairs a person's ability to read. These individuals typically read at levels significantly lower than expected despite having normal intelligence. Although the disorder varies from person to person, common characteristics among people with dyslex...
What causes hereditary leiomyomatosis and renal cell cancer? Hereditary leiomyomatosis and renal cell cancer (HLRCC) is caused by changes (mutations) in the FH gene. This gene gives the body instructions for making an enzyme called fumarase which is needed for a series of reactions that lets cells use oxygen and energy...
How is Wolfram syndrome diagnosed? A diagnosis of Wolfram syndrome is based on the presence of characteristic signs and symptoms. The identification of a change (mutation) in the WFS1 gene or CISD2 gene confirms the diagnosis. Is genetic testing available for Wolfram syndrome? Yes. Clinical genetic testing is available...
Subacute cerebellar degeneration is the breakdown of the area of the brain that controls muscle coordination and balance (the cerebellum). Less commonly, the area connecting the spinal cord to the brain is involved. Subacute cerebellar degeneration may occur in association with a cancer (paraneoplastic cerebellar degen...
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.