Nutrition basics
Learning Center
Ascariasis
Learn more about the causes, treatment and prevention of this roundworm infection.
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Ataxia
Often caused by an underlying condition, this loss of muscle control and coordination can impact movement, speech and swallowing.
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.
Avulsion fracture: How is it treated?
Surgery is rarely needed to reattach a small chunk of bone when it gets pulled away from the main part of the bone by a tendon or ligament.
Baby teeth: When do children start losing them?
Losing baby teeth is a big childhood event. Find out what to expect.
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
Bicuspid aortic valve
This condition, present at birth, affects the valve between the lower left heart chamber and the body's main artery. Know the symptoms and treatment.
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