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Epididymitis is an inflammation or infection of the epididymis. This is a thin, coiled tube that sits on top of a male testicle. In younger boys, this condition can be caused by a urinary tract infection. In older boys and teens, it's often caused by a sexually transmitted infection (STI).

A step-by-step look at how to get and keep an erection with a vacuum erection therapy system.

Nerve conduction studies (NCS) and electromyography (EMG) are tests that measure muscle and nerve function. In most cases, both tests are done.

You will be having electromyography (EMG) and nerve conduction studies (NCS) to measure muscle and nerve function. In most cases, both tests are done.

Evoked potential tests measure the electrical activity in the brain as nerve pathways are stimulated.

Coping with a brain tumor is one of the most difficult things you might face. These tips can help you during this time.

Do you know what to do if you encounter an emergency? Follow these clear instructions and be prepared.

To be comfortable, your eyes need to be lubricated, or bathed, with tears. But if your eyes don't make enough tears, the surface gets irritated. This is known as dry eyes.

Glasses can correct presbyopia. They focus the image back onto the retina. This way, you can see an object clearly. There are several kinds of glasses you can choose from.