Fitness basics
Learning Center
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.
Atypical cells: Are they cancer?
Atypical cells appear abnormal, but they aren't necessarily cancerous.
BRCA gene test for breast and ovarian cancer risk
Find out what to expect if you're considering a blood test to determine if you have an increased risk of breast cancer. Learn what your results might mean.
Baby teeth: When do children start losing them?
Losing baby teeth is a big childhood event. Find out what to expect.
Balance exercises
These exercises can improve balance and help prevent falls. See how they're done.
Barium enema
Find out how to prepare and what to expect if your doctor has recommended a barium enema.
Belly fat in men: Why weight loss matters
Belly fat can be dangerous. Understand why and how to get rid of it.
Benign prostatic hyperplasia (BPH)
This common problem, also known as an enlarged prostate, can be treated.
Bent penis
Learn what can cause a curved erection and when you may need to see a health care provider.
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