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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.
Attention-deficit/hyperactivity disorder (ADHD) in children
This condition affects children, and may continue into adulthood. It can include difficulty sustaining attention, hyperactivity and impulsive behavior.
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.
Autism spectrum disorder and digestive symptoms
Children with autism spectrum disorder often have other health issues, including problems related to digestion.
Autoimmune pancreatitis
Autoimmune pancreatitis is a relatively uncommon disease of the pancreas that may be mistaken for pancreatic cancer.
Awake brain surgery
Awake brain surgery is performed while you are awake and alert. This type of brain surgery may be used to treat some brain tumors or epileptic seizures.
Bee sting
Learn more about symptoms, treatment, self-care tips and prevention of bee stings, which in some people cause severe allergic reaction.
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