Encyclopedia > Headache

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Headache

A headache is a condition of mild to severe pain in the head; sometimes upper back or neck pain may also be interpreted as a headache.

Headaches have a wide variety of causes, ranging from eyestrain to inflammation of the sinus cavities to life-threatening conditions such as encephalitis. When the headache occurs in conjunction with a head injury the cause is usually quite evident; however, many causes of headaches are more elusive.

See Also: Migraine



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... 1753 1754 1755 1756 1757 - 1758 - 1759 1760 1761 1762 1763 Events December 25 - Halley's Comet appears First European settlement in what is now Erie ...