Symptoms and Causes

What To Know About Black Hairy Tongue Black hairy tongue is a condition that makes the tongue appear dark and fuzzy. This happens when dead skin…

Overview Balance problems can cause dizziness, unsteadiness, or feelings of spinning. These symptoms may occur in any position—lying down, sitting, or standing. To maintain normal balance,…

What Is Ataxia? Ataxia refers to poor muscle control that results in uncoordinated movements. This condition affects several physical functions: The cerebellum, a region of the…

Overview An asthma attack occurs when asthma symptoms suddenly get worse. During an attack, the airways in the lungs narrow significantly, making breathing difficult. People experiencing…

Overview The lungs contain many small airways that branch out like tree limbs. The largest airways (bronchi) divide into smaller tubes called bronchioles. These tiny airways…

Overview Aortic valve stenosis is a serious heart valve disease where the aortic valve narrows, restricting blood flow from the heart to the body. This condition…

Overview Antiphospholipid syndrome occurs when the immune system incorrectly produces antibodies that attack body tissues. These antibodies can cause dangerous blood clots in arteries and veins…

Overview Amenorrhea is a condition where menstrual periods are absent. It comes in two main types. Primary amenorrhea happens when someone hasn’t had their first period…

Overview Wilson’s disease is a rare genetic disorder where copper accumulates in the body. This usually happens in the liver, brain, and eyes. Most diagnoses occur…

Overview Acute lymphocytic leukemia (ALL) is a fast-growing cancer that affects the blood and bone marrow. This disease rapidly produces immature blood cells instead of healthy,…