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Blood in semen

This symptom can be scary, but the cause is most often not cancer. Find out…

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Blood in urine (hematuria)

Lots of things can cause bloody urine. Some are serious problems, and others are harmless.…

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Blood pressure: Can it be higher in one arm?

A small difference in blood pressure readings between arms usually isn't a worry. But a…

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Blood pressure chart: What your reading means

Checking your blood pressure helps you avoid health problems. Learn more about what your numbers…

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Blood pressure cuff: Does size matter?

Accurate blood pressure readings depend on the proper size blood pressure cuff.

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Blood pressure: Does it have a daily pattern?

Like many body functions, blood pressure has a daily pattern. Find out more.

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Blood pressure: Is it affected by cold weather?

Blood pressure generally is higher in the winter than in the summer. Discover why.

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Blood pressure medication: Still necessary if I lose weight?

Losing weight may reduce or end the need for blood pressure medicine.

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Blood pressure medications: Can they raise my triglycerides?

Learn which blood pressure medicines might raise triglyceride levels.

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Blood pressure readings: Why higher at home?

Blood pressure that always measures higher outside a medical office is called masked hypertension.

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Blood pressure test

Learn how this simple test is done, how often you need one and what the…

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Blood sugar levels can fluctuate for many reasons

Unexplained changes in blood sugar levels can be the result of illness, injury, stress and…

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Blood sugar testing: Why, when and how

If you have diabetes, it's important to check the level of sugar in your blood.…

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Blood tests for heart disease

Learn how certain blood tests can offer clues to heart health.

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Blood thinners: Can I still get blood clots?

These medicines must be taken exactly as directed to prevent blood clots.

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Blood transfusion

A blood transfusion can help replace blood lost due to injury or surgery. It also…

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Blood urea nitrogen (BUN) test

Learn about the blood urea nitrogen (BUN) test to assess kidney function and what possible…

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Body dysmorphic disorder

This mental disorder causes persistent, intense focus, shame and anxiety over perceived body defects, often…

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Body lice

These tiny bugs can live in your clothing and feed on your blood. Find out…

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Boils and carbuncles

Learn about symptoms, causes, treatment and prevention of these painful pus-filled infections that cause bumps…

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Bone and joint problems associated with diabetes

If you have diabetes, you're at increased risk of various bone and joint disorders.

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Bone cancer

Bone cancer most commonly affects the long bones in the arms and legs. Some types…

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Bone density test

If your doctor suspects you have osteoporosis, a bone density test can assess your bone…

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Bone health: Tips to keep your bones healthy

Find out what you can do to support and protect bone health.

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Bone marrow biopsy and aspiration

Learn what to expect with these tests, which are done to make sure your bone…

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Bone marrow transplant

Learn about this procedure that replaces unhealthy bone marrow with stem cells. Your own cells,…

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Bone metastasis

Learn about the symptoms and causes of cancer that spreads to the bones. Find out…

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Bone scan

This diagnostic test can be used to check for cancer that has spread to the…

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Bone spurs

Joint damage due to osteoarthritis is the most common cause of these bony growths.

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Borderline personality disorder

This mental health condition affects how you see yourself. It includes unstable and intense relationships,…

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