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Atrial septal defect (ASD)
This heart problem that is present at birth causes a hole between the heart's upper chambers. It can be treated.
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 antidepressants
Bupropion, mirtazapine, nefazodone, trazodone, vilazodone, vortioxetine and esketamine are unique atypical antidepressants, each working in different ways.
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.
Automated external defibrillators: Do you need an AED?
These potentially lifesaving machines are available without a prescription. Should you get one?
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.
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