Third trimester
Learning Center
Bleeding during pregnancy
Learn what may cause vaginal bleeding during pregnancy and when you should see a doctor about it.
Blighted ovum: What causes it?
A Mayo Clinic specialist explains what's behind this type of early pregnancy loss.
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.
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.
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.
Bone marrow biopsy and aspiration
Learn what to expect with these tests, which are done to make sure your bone marrow is healthy.
Bone marrow transplant
Learn about this procedure that replaces unhealthy bone marrow with stem cells. Your own cells, donor cells or cells from umbilical cord blood may be 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.
Brain stereotactic radiosurgery
This procedure delivers precise radiation therapy to treat brain tumors and other brain conditions.
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