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Asplenia
Asplenia means that a person does not have a spleen or that the spleen does not work effectively. The spleen helps filter…
Ast Blood Test
An AST blood test measures aspartate aminotransferase, an enzyme also called AST or SGOT. AST is found in liver cells as well…
Asthenozoospermia
Asthenozoospermia means that sperm have reduced motility, or less ability to move effectively. Because sperm usually need to travel through the reproductive…
Asthma
Asthma is a long-term condition in which inflammation and tightening make the airways narrower and harder for air to move through. Symptoms…
Astigmatism
Astigmatism is a common refractive error caused by an uneven curve in the cornea or lens. Instead of focusing light evenly on…
Astrocytoma
Astrocytoma is a primary brain or spinal cord tumor that begins in astrocytes, support cells that help nerve cells work properly. An…
Astrovirus Infection
Astrovirus infection is a contagious viral infection of the digestive tract that commonly causes gastroenteritis, including diarrhea and vomiting. It most often…
Atopic Dermatitis
Atopic dermatitis is a chronic inflammatory skin condition that causes dry, itchy, irritated skin. It often begins in childhood, but people of…
Atrial Fibrillation
Atrial fibrillation is an irregular, often rapid heartbeat caused by disorganized electrical signals in the heart’s upper chambers, called the atria. Instead…
Atrial Premature Depolarization
Atrial premature depolarization is an early electrical impulse that starts in the atria, the heart’s upper chambers, before the next expected heartbeat.…
Attention Deficit Hyperactivity Disorder
Attention Deficit Hyperactivity Disorder (ADHD) is a medical condition involving persistent patterns of difficulty with attention, activity level, or impulse control. These…
Autism
Autism is a lifelong neurodevelopmental condition that affects how a person communicates, interacts, learns, or experiences sensory information. It is often described…
Autoimmune Hepatitis
Autoimmune hepatitis is a long-term liver disease in which the immune system mistakenly attacks healthy liver cells. This immune attack causes inflammation…
Autonomic Neuropathy
Autonomic neuropathy is damage to the autonomic nerves, which control body functions that usually happen without conscious effort. These autonomic functions include…
