OverviewArteriosclerosis occurs when the blood vessels that carry oxygen and nutrients from your heart to the rest of your body (arteries) become thick and stiff — sometimes restricting blood flow to your organs and tissues. Healthy art...

Arteriosclerosis occurs when the blood vessels that carry oxygen and nutrients from your heart to the rest of your body (arteries) become thick and stiff — sometimes restricting blood flow to your organs and tissues. Healthy arteries are fle...

Atherosclerosis-deafness-diabetes-epilepsy-nephropathy syndrome is a rare genetic disorder characterized by a combination of atherosclerosis (hardening of the arteries), deafness, diabetes, epilepsy, and nephropathy (kidney disease). It is caused ...

Athlete's foot, also known as tinea pedis, is a common fungal infection that affects the skin on the feet. It is caused by various types of fungi, most commonly Trichophyton rubrum. Athlete's foot is highly contagious and can be spread through dir...

Athyreosis is a rare medical condition in which the thyroid gland fails to develop properly during fetal development. It is characterized by the absence of the thyroid gland, which can lead to a variety of symptoms, including growth retardation, m...

Atkin-Flaitz syndrome is a rare genetic disorder characterized by intellectual disability, seizures, and facial abnormalities. It is caused by a mutation in the gene that codes for the enzyme dihydropyrimidine dehydrogenase (DPD). Symptoms of Atki...

Atopic dermatitis facts Atopic dermatitis is a type of eczema. The disease may be inherited and genetically determined. The patient's skin may be "super sensitive" to many irritants. Dry, scaly patches ...

Atopic keratoconjunctivitis is a chronic, inflammatory eye condition that affects the cornea and conjunctiva. It is a type of allergic eye disease that is caused by an allergic reaction to environmental allergens such as pollen, dust mites, and an...

ATP13A2-related juvenile neuronal ceroid lipofuscinosis (also known as Kufor-Rakeb Syndrome) is a rare, inherited, neurodegenerative disorder that affects the nervous system. It is caused by mutations in the ATP13A2 gene, which is responsible for ...

ATR-16 Syndrome is a rare genetic disorder caused by a mutation in the ATR gene. It is characterized by intellectual disability, developmental delays, and a variety of physical abnormalities. People with ATR-16 Syndrome may have difficulty with sp...

Atransferrinemia is a rare inherited disorder in which the body is unable to produce enough of the iron-binding protein transferrin. This protein is responsible for transporting iron throughout the body, and without it, iron levels can become dang...

Atresia of the urethra is a rare congenital disorder in which the urethra is abnormally closed or absent. This condition can occur in both males and females, but is more common in males. In males, the urethra is the tube that carries urine from th...

Atrial fibrillation (A-fib) is an irregular and often very rapid heart rhythm (a...

Atrial fibrillation (A-fib) is an irregular and often very rapid heart rhythm (arrhythmia) that can lead to blood clots in the heart. A-fib increases the risk of stroke, heart failure and other he...

Atrial fibrillation (AFib) facts Atrial fibrillation (also referred to as AFib) is the most common type of abnormal heart rhythm. AFib is caused by abnormal electrical discharges (signals) that generate chaotically throughout the upp...

Atrial septal aneurysm (ASA) is a congenital heart defect in which the wall between the two upper chambers of the heart (the atria) is abnormally thickened. This can cause blood to flow between the two chambers, leading to an increased risk of str...

Atrial septal defect, coronary sinus type (ASD-CS) is a rare congenital heart defect in which the atrial septum, the wall between the two upper chambers of the heart, is not completely formed. Instead, there is an opening between the two chambers ...