Fertility
Learning Center
Asthma
Find out what can trigger asthma and how to relieve your symptoms and breathe easier.
Asthma attack
Learn how to recognize when you need to use quick-relief treatment or get emergency care.
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Astrocytoma
Learn about this type of cancer that can occur in the brain or spinal cord.
Ataxia
Often caused by an underlying condition, this loss of muscle control and coordination can impact movement, speech and swallowing.
Atelectasis
Atelectasis means a collapse of the whole lung or an area of the lung. It's one of the most common breathing complications after surgery.
Athlete's foot
Learn about the causes, symptoms, prevention and treatment of this common fungal skin infection.
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.
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.
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.
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