Toddler health
Learning Center
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.
Blood clots during menstruation: A concern?
Blood clots during menstrual periods aren't always a cause for a concern. But passing large clots may be a sign that something is wrong.
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.
Brachial plexus injury
Learn about these nerve injuries that usually result from auto or motorcycle accidents, and find out which procedures can help restore arm function.
Breast MRI
Learn more about how this imaging test helps diagnose cancer and when it's used.
Breast augmentation
Find out about surgery to increase breast size, as well as the risks, benefits, possible complications and follow-up care.
Breast biopsy
Learn about this test that's used to diagnose breast cancer, including why it's done, risks and what to expect.
Breast calcifications
Most breast calcifications are benign. Find out more about what can cause them, what they look like, and when to see a doctor.
Breast cancer
Learn about this common cancer, including information on prevention, symptoms, diagnosis and treatment.
Breast cancer chemoprevention: Drugs that reduce risk
Learn about the drugs that can help prevent breast cancer in people at high risk.
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