Aerobic exercise
Learning Center
Birthmarks
Learn to identify types of birthmarks by how the skin looks. Examples include café au lait spot, congenital nevus, port-wine stain and hemangioma.
Bent penis
Learn what can cause a curved erection and when you may need to see a health care provider.
Benign prostatic hyperplasia (BPH)
This common problem, also known as an enlarged prostate, can be treated.
Belly fat in men: Why weight loss matters
Belly fat can be dangerous. Understand why and how to get rid of it.
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
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.
Aquatic exercises
Thinking about signing up for an aquatic exercise class? Or trying water exercises on your own? Check out these pool moves.
Aortic calcification: An early sign of heart valve problems?
Aortic valve calcification — once thought a harmless condition — may be a sign of heart valve disease.
Alzheimer's and dementia: What's the difference?
The terms 'Alzheimer's disease' and 'dementia' are often used to mean the same thing — but here's the real difference between them.
Allergies and asthma: They often occur together
Allergies and asthma? Find out how to control both conditions.
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