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Atrial tachycardia
This type of fast heartbeat may occur after heart surgery or during pregnancy. But infections may trigger it, too. Learn how it's diagnosed and treated.
Atrioventricular canal defect
This congenital heart defect involves a hole in the heart. It affects blood flow through the heart valves. Learn the symptoms and how it's treated.
Atrioventricular nodal reentry tachycardia (AVNRT)
This most common type of supraventricular tachycardia, a type of irregular heartbeat, tends to occur in young women. Know the symptoms and treatment.
Atypical hyperplasia of the breast
Learn how a diagnosis of atypical lobular hyperplasia or atypical ductal hyperplasia affects your risk of breast cancer and what you can do.
Auditory processing disorder (APD)
This type of hearing loss involves the brain. Learn about ways that can help people with the condition hear better.
Autism spectrum disorder
Autism spectrum disorder is a serious condition related to brain development that impairs the ability to communicate and interact with others.
Autoimmune hepatitis
This type of hepatitis happens when the immune system attacks the liver with destructive antibodies. Immune-suppressing medicine is the main treatment.
Autoimmune pancreatitis
Autoimmune pancreatitis is a relatively uncommon disease of the pancreas that may be mistaken for pancreatic cancer.
Autonomic neuropathy
Damage to the nerves that control involuntary body functions, such as blood pressure and digestion, results in autonomic neuropathy.
Avascular necrosis (osteonecrosis)
A broken bone or dislocated joint can block blood flow to the bone, causing bone tissue to die.
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