Headaches and migraines
A headache is defined as a pain in the head or upper neck (Benjamin C. Wedro, unknown). A migraine is caused by enlarged blood vessels, this causes a release of chemicals from nerve fibres that coil around the large arteries of the brain. The chemicals cause inflammation, pain, and further enlargement of the artery, which causes more pain. (Melissa Conrad Stöppler, Unkown)
The causes of headaches are many, among them flu, colds, stress, sunstroke, sinusitis, neuralgia, too much TV, bright or bad lighting causing eyestrain (Bachmann, 2002).
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