Arachnoiditis is a rare, chronic, and often debilitating neurological disorder caused by inflammation of the arachnoid, one of the membranes that surround and protect the nerves of the spinal cord. Symptoms of arachnoiditis can include pain, numbn...

Chikungunya is a rare viral infection transmitted by the bite of an infected mosquito. It is characterized by a rash, fever, and severe joint pain (arthralgias) that usually lasts for three to seven days. Because of its effect on the joints, Chiku...

Arcus senilis is a white or gray arc or circle that appears around the outer edge of the cornea of the eye. It is a normal part of aging and is usually seen in people over the age of 60. It is caused by a deposit of lipids in the cornea and is har...

AREDYLD syndrome is a rare genetic disorder characterized by intellectual disability, seizures, and delayed development. It is caused by a mutation in the AREDYLD gene, which is responsible for the production of a protein involved in the developme...

Regenerative anemia is a type of anemia in which the body is unable to produce enough red blood cells to replace those that are lost. This type of anemia is caused by a decrease in the production of red blood cells in the bone marrow, which is the...

Argentine hemorrhagic fever (AHF) is a rare and potentially fatal viral disease caused by the Junin virus, a member of the Arenaviridae family. It is found in rural areas of Argentina, where it is spread by contact with infected rodents. Symptoms ...

Arginase deficiency is a rare inherited disorder characterized by complete or partial lack of the enzyme arginase. Arginase is one of six enzymes that play a role in the breakdown and removal of nitrogen from the body, a process known as the urea ...

Arginase-1 deficiency is a rare genetic disorder caused by a mutation in the arginase-1 gene. This gene is responsible for producing the enzyme arginase-1, which is necessary for the body to break down the amino acid arginine. Without this enzyme,...

Arginase deficiency is a rare inherited disorder characterized by complete or partial lack of the enzyme arginase. Arginase is one of six enzymes that play a role in the breakdown and removal of nitrogen from the body, a process known as the urea ...

Argininemia is an inherited metabolic disorder caused by a deficiency of the enzyme arginase. This enzyme is responsible for breaking down the amino acid arginine, which is essential for normal growth and development. People with argininemia are u...

Argininie Glycine Amidinotransferase Deficiency (AGAT Deficiency) is a rare genetic disorder caused by a deficiency of the enzyme arginine glycine amidinotransferase (AGAT). AGAT is responsible for the production of creatine, an important molecule...

Argininosuccinic aciduria is a rare inherited disorder characterized by deficiency or lack of the enzyme argininosuccinate lyase (ASL). Argininosuccinate lyase is one of six enzymes that play a role in the breakdown and removal of nitrogen from th...

Argininosuccinic aciduria is a rare inherited disorder characterized by deficiency or lack of the enzyme argininosuccinate lyase (ASL). Argininosuccinate lyase is one of six enzymes that play a role in the breakdown and removal of nitrogen from th...

Argininosuccinic aciduria (ASA) is an inherited metabolic disorder caused by a deficiency of the enzyme argininosuccinate lyase. This enzyme is responsible for breaking down the amino acid arginine, which is essential for normal growth and develop...

Ahumada-Del Castillo is a rare endocrine disorder affecting adult females, which is characterized by impairment in the function of the pituitary and hypothalamus glands. Symptoms may include the production of breast milk (lactation) not associated...

Argyria is a rare condition caused by long-term exposure to silver. It is characterized by a blue-gray discoloration of the skin, eyes, and mucous membranes. It is caused by the accumulation of silver particles in the body, which can be ingested t...

Holoprosencephaly (HPE) is the failure of the prosencephalon, or forebrain, to develop normally. The forebrain is a region of the brain in the fetus that develops into parts of the adult brain, including the cerebral cortex. Instead of the normal ...