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The first sign of shingles is often burning or tingling pain, or sometimes numbness, in or under the skin. You may also feel ill with fever, chills, headache, or upset stomach.

A glenoid labral tear and a torn rotator cuff are just two common injuries that can happen with the shoulder. Can you think of others? Find out how much you know about shoulders by taking this quiz, based on information from the National Institute of Arthritis and Musculoskeletal and Skin Diseases.

Red blood cells are usually doughnut-shaped. In a person with sickle cell anemia, the red blood cells are shaped like a C--like a sickle.

When your sleep is upset throughout the night, you can be very sleepy during the day. Maybe you have sleep apnea.

Why is sleep important? See how much you know about snoozing by taking this quiz.

A good night's sleep—everyone needs it, but not everyone gets it. We stay up late and get up early, and then wonder why we always feel tired. Why is sleep important? See how much you know about snoozing by taking this quiz.

Here is the latest information about nicotine replacements, inhaler therapy, and other aids that can help you stop smoking.

They fascinate. They repel. Some pose a danger. Most are harmless. And whether they are seen as scary creatures or colorful curiosities, snakes play important environmental roles in the fragile ecosystems of the nation's wildlife areas.

Answer this one: If you have a streptococcal infection, what is a good way to prevent its spread?