Eyestrain

Eyestrain Definition: Eyestrain occurs when your eyes get tired from intense use, such as driving a car for extended periods, reading or working at a computer. Although eyestrain can be annoying, it usually isn't serious and goes away once you rest your eyes. In some cases, signs and symptoms of eyestrain can indicate an underlying eye condition that needs treatment. Although you may not be able to change the nature of your job or all the...

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Eye melanoma

Eye melanoma Definition: Melanoma is a type of cancer that develops in the cells that produce melanin — the pigment that gives your skin its color. Your eyes also have melanin-producing cells and can develop melanoma. Eye melanoma is also called ocular melanoma. Most eye melanomas form in the part of the eye you can't see when looking in a mirror. This makes eye melanoma difficult to detect. In addition, eye melanoma typically doesn't...

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Eye floaters

Eye floaters Definition: Eye floaters are spots in your vision. Eye floaters may look like black or gray specks, strings or cobwebs that drift about when you move your eyes. Most eye floaters are caused by age-related changes that occur as the jelly-like substance (vitreous) inside your eyes becomes more liquid. When this happens, microscopic fibers within the vitreous tend to clump together and can cast tiny shadows on your retina, which...

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External compression headaches

External compression headaches Definition: External compression headaches can occur when any head wear puts continuous pressure on your forehead or scalp. Common culprits of external compression headaches include tight hats, helmets, headbands and goggles. These headaches are sometimes known by other names that are specific to the type of equipment causing your headache, such as "swim-goggle headache" or "football-helmet headache." With...

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Exercise-induced asthma

Exercise-induced asthma Definition: If you cough, wheeze or feel out of breath during or after exercise, it may be more than exertion causing your symptoms. You might have exercise-induced asthma. As with asthma triggered by other things, exercise-induced asthma symptoms occur when your airways tighten and produce extra mucus. If you have exercise-induced asthma — also called exercise-induced bronchospasm (BRONG-ko-spaz-um) — physical...

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Exercise headaches

Exercise headaches Definition  : Exercise headaches occur during or after sustained, strenuous exercise. Activities associated with exercise headaches include running, rowing, tennis, swimming and weightlifting. Doctors divide exercise headaches into two categories. Primary exercise headaches are usually harmless, aren't connected to any underlying problems and can often be prevented with medication. Secondary exercise headaches,...

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Essential tremor

Essential tremor Definition  : Essential tremor is a disorder of the nervous system that causes a rhythmic shaking. Essential tremor can affect almost any part of your body, but the trembling occurs most often in your hands — especially when you try to do simple tasks, such as drinking from a glass, tying shoelaces, writing or shaving. Essential tremor also may affect your head, voice, arms or legs. Although usually not a dangerous...

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