African Iron Overload is a condition caused by a genetic mutation that leads to an excessive accumulation of iron in the body. It is most commonly found in people of African descent, particularly those of West African origin. Symptoms of African I...

African tick typhus is a bacterial infection caused by Rickettsia africae, a type of bacteria found in certain types of ticks. It is spread through the bite of an infected tick, and symptoms can include fever, headache, rash, and muscle aches. Tre...

African trypanosomiasis, also known as sleeping sickness, is a parasitic disease caused by the protozoan Trypanosoma brucei. It is transmitted to humans through the bite of an infected tsetse fly. Symptoms of the disease include fever, headaches, ...

Agammaglobulinemia is a rare, inherited disorder in which the body is unable to produce enough antibodies to fight off infections. It is caused by a mutation in the gene that codes for the B-cell receptor, which is responsible for recognizing and ...

Agammaglobulinemia-microcephaly-craniosynostosis-severe dermatitis syndrome (AMCSD) is a rare genetic disorder characterized by a lack of antibodies (agammaglobulinemia), a small head size (microcephaly), premature closure of the skull bones (cran...

Age-related macular degeneration (AMD) is a medical condition that affects the macula, a small area in the center of the retina at the back of the eye. It is a leading cause of vision loss in people over the age of 50. AMD causes damage to the mac...

AGel amyloidosis is a rare, inherited form of amyloidosis caused by a mutation in the AGel gene. It is characterized by the buildup of abnormal proteins in the body's organs and tissues, which can lead to organ failure. Symptoms of AGel amyloidosi...

Agenesis of corpus callosum (ACC) is a rare disorder that is present at birth (congenital). It is characterized by a partial or complete absence (agenesis) of an area of the brain that connects the two cerebral hemispheres. This part of the brain ...

Agenesis of corpus callosum (ACC) is a rare disorder that is present at birth (congenital). It is characterized by a partial or complete absence (agenesis) of an area of the brain that connects the two cerebral hemispheres. This part of the brain ...

Agenesis of corpus callosum (ACC) is a rare birth defect in which the corpus callosum, the band of nerve fibers connecting the two hemispheres of the brain, is either partially or completely absent. This condition can cause a variety of physical a...

Agenesis of the superior vena cava (SVC) is a rare congenital disorder in which the superior vena cava, a major vein that carries blood from the head and arms to the heart, is absent or incompletely formed. This condition can cause a variety of sy...

...

Aggressive NK-cell leukemia is a rare type of cancer that affects a type of white blood cell called natural killer (NK) cells. It is an aggressive form of leukemia that is characterized by an overproduction of NK cells in the blood and bone marrow...

Aggressive systemic mastocytosis (ASM) is a rare, life-threatening disorder caused by an abnormal increase in mast cells in the body. Mast cells are a type of white blood cell that play an important role in the body’s immune system. In ASM, the ...

Agoraphobia is a fear of being outside or otherwise being in a situation from which one either cannot escape or from which escaping would be difficult or humiliating. Like other phobias, agoraphobia often goes unreported, probably b...

Acquired agranulocytosis is a rare, drug-induced blood disorder that is characterized by a severe reduction in the number of white blood cells (granulocytes) in the circulating blood. The name granulocyte refers to grain-like bodies within the cel...

A blood disorder characterized by low levels of white blood cells (granular leukocytes) in the circulating blood. The condition is usually caused by certain drugs especially chemotherapy drugs....