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Learning Center
Blood pressure chart: What your reading means
Checking your blood pressure helps you avoid health problems. Learn more about what your numbers mean.
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 density test
If your doctor suspects you have osteoporosis, a bone density test can assess your bone strength. Learn about the risks and results of this procedure.
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 AVM (arteriovenous malformation)
Tangled blood vessels in the brain affect typical blood flow in this rare condition. Learn more.
Brain stereotactic radiosurgery
This procedure delivers precise radiation therapy to treat brain tumors and other brain conditions.
Breast biopsy
Learn about this test that's used to diagnose breast cancer, including why it's done, risks and what to expect.
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