Healthy diets
Learning Center
Autism spectrum disorder
Autism spectrum disorder is a serious condition related to brain development that impairs the ability to communicate and interact with others.
Auditory processing disorder (APD)
This type of hearing loss involves the brain. Learn about ways that can help people with the condition hear better.
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.
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.
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.
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.
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 fibrillation
A fast, pounding heartbeat could be due to AFib, a type of heart rhythm problem. Know the warning signs and when treatment is needed.
Atopic dermatitis (eczema)
Learn about the causes, symptoms and treatments of this itchy rash that most often begins before age 5, is persistent, and has periods of clearing and relapse.
Athlete's foot
Learn about the causes, symptoms, prevention and treatment of this common fungal skin infection.
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