First trimester
Learning Center
Bedsores (pressure ulcers)
These areas of damaged skin and tissue are caused by sustained pressure — often from a bed or wheelchair — that reduces blood flow to vulnerable areas of the body.
Bee sting
Learn more about symptoms, treatment, self-care tips and prevention of bee stings, which in some people cause severe allergic reaction.
Behcet's disease
This rare disorder causes blood vessel inflammation throughout the body. Signs and symptoms depend on which parts of the body are affected.
Bell's palsy
Learn more about this condition that causes temporary facial paralysis. Find out why it happens and what to do about it.
Benign adrenal tumors
Most of these tumors need no treatment, but some do. Learn about diagnosis and treatment options.
Benign paroxysmal positional vertigo (BPPV)
Learn more about the symptoms, causes and treatment of intense dizziness episodes.
Benign peripheral nerve tumor
Learn more about the different types of tumors that grow on or around the nerves that link to the brain and spinal cord.
Benign prostatic hyperplasia (BPH)
This common problem, also known as an enlarged prostate, can be treated.
Bicuspid aortic valve
This condition, present at birth, affects the valve between the lower left heart chamber and the body's main artery. Know the symptoms and treatment.
Bile reflux
This digestive problem tends to develop in people who've had stomach surgery and sometimes contributes to gastroesophageal reflux disease (GERD).
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