Nutrition basics
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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.
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.
Ataxia
Often caused by an underlying condition, this loss of muscle control and coordination can impact movement, speech and swallowing.
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Asthma and acid reflux: Are they linked?
A Mayo Clinic expert discusses how acid reflux can make asthma worse.
Ascariasis
Learn more about the causes, treatment and prevention of this roundworm infection.
Artificial sweeteners and other sugar substitutes
Get the facts on products that make food and drinks sweeter.
Arteriovenous malformation
In this condition, a tangle of blood vessels affects the flow of blood and oxygen. Treatment can help.
Are energy drinks bull?
Thanks to a large amount of sugar and caffeine, energy drinks might give you a temporary energy boost. But too much sugar from energy drinks can add extra pounds. And too much caffeine can cause adverse side effects, such as nervousness, stomach upset, irritability, increased heart rate and insomnia. There are better ways to boost your energy. For example, get enough sleep, exercise regularly and eat a healthy diet.
Aortic valve stenosis
Learn more about the symptoms and treatment of this condition that reduces or blocks blood flow from the heart to the body.
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