Fitness basics
Learning Center
Blood in semen
Finding blood in your semen can be alarming, but the cause is usually benign. Find out possible causes and when to see a doctor.
Blocked tear duct
Watery, irritated eyes may occur when your tears can't drain normally. Learn about this common eye condition that affects newborns and sometimes, adults.
Bladder outlet obstruction: Causes in men?
Find out more about the causes of male bladder outlet obstruction and possible next steps.
Bladder infection in men
Although women are more likely to get bladder infections, men can get them, too. Learn about signs and symptoms and what could put you at risk.
Bipolar disorder in children: Is it possible?
Bipolar disorder in children and teenagers is possible. Finding it early and treating it can help.
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.
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.
Benign peripheral nerve tumor
Learn more about the different types of tumors that grow on or around the nerves that link to the brain and spinal cord.
Benign adrenal tumors
Most of these tumors need no treatment, but some do. Learn about diagnosis and treatment options.
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