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Learning Center
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
Types of dermatitis
Learn to identify types of dermatitis by how the skin looks. Examples include atopic dermatitis, contact dermatitis and seborrheic dermatitis.
How your brain works
Which part of your brain does what? Take a tour.
Bent penis
Learn what can cause a curved erection and when you may need to see a health care provider.
Frequent sex: Does it protect against prostate cancer?
Some studies have suggested that frequent ejaculation may reduce the risk of prostate cancer. But other research hasn't supported this idea.
Enlarged breasts in men (gynecomastia)
Learn how an imbalance of the hormones estrogen and testosterone can cause breast tissue swelling in boys or men.
Recurrent prostate infection: What are the treatment options?
These infections that keep coming back can be hard to treat. Here's what to know.
HPV infection: A cause of cancer in men?
Learn what types of cancer human papillomavirus can cause and how you can lower your risk.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Prostate biopsy
Find out about this procedure that's used to diagnose prostate cancer. Learn about the risks, how to prepare and what you can expect.