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Atrial fibrillation Atrial fibrillation In a typical heart, a tiny group of cells at the sinus node sends out an electrical signal. The signal travels through the heart's upper chambers to the atrioventricular (AV) node. The signal then passes into t...
Atrial flutter Atrial flutter Atrial flutter is a type of heart rhythm disorder in which the heart's upper chambers (atria) beat too quickly. In atrial flutter, the heart's upper chambers (atria) beat too quickly. This causes the heart to beat in a f...
An atrial septal defect (ASD) is a heart condition that you're born with. That means it's a congenital heart defect. People with an ASD have a hole between the upper heart chambers. The hole increases the amount of blood going through the lungs. Smal...
Attention-deficit/hyperactivity disorder (ADHD) is a chronic condition that affects millions of children and often continues into adulthood. ADHD includes a combination of persistent problems, such as difficulty sustaining attention, hyperactivity an...
Breast anatomy Breast anatomy Each breast contains 15 to 20 lobes of glandular tissue, arranged like the petals of a daisy. The lobes are further divided into smaller lobules that produce milk for breastfeeding. Small tubes, called ducts, conduct the...
Auditory processing disorder, also called APD, is a type of hearing loss caused by something affecting the part of the brain that processes how you hear. Ear damage causes other types of hearing loss. APD is also sometimes called central auditory pro...
Autism spectrum disorder is a condition related to brain development that impacts how a person perceives and socializes with others, causing problems in social interaction and communication. The disorder also includes limited and repetitive patterns ...
Autoimmune hepatitis is a liver disease that happens when the body's immune system attacks the liver. This can cause swelling, irritation and damage to the liver. The exact cause of autoimmune hepatitis is unclear, but genetic and environmental facto...
Autoimmune pancreatitis is an inflammation in the pancreas. It may be caused by the immune system attacking the pancreas. Autoimmune pancreatitis also is called AIP. Two subtypes of AIP are now recognized, type 1 and type 2. Type 1 AIP is called IgG4...
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