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Breast MRI
Learn more about how this imaging test helps diagnose cancer and when it's used.
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.
Bone marrow biopsy and aspiration
Learn what to expect with these tests, which are done to make sure your bone marrow is healthy.
Bone cancer
Bone cancer most commonly affects the long bones in the arms and legs. Some types happen mostly in children, while others affect mostly adults.
Body lice
Body lice are tiny insects that live in your clothing and feed on your blood. Find out how to treat and prevent this itchy nuisance of a bug.
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.
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.
Blighted ovum: What causes it?
A Mayo Clinic specialist explains what's behind this type of early pregnancy loss.
Bleeding during pregnancy
Learn what may cause vaginal bleeding during pregnancy and when you should see a doctor about it.
Bleeding after menopause: A concern?
It's unusual to bleed from the vagina after menopause. Learn what health problems can cause it and why you need to see your health care provider.
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