User-edited article about headache, the condition of pain in the head, its types, diagnosis, treatment, and prevention.
en.wikipedia.org/wiki/Headache
A headache is pain or discomfort in the head, scalp, or neck. Serious causes of headaches are extremely rare. ... The pain may feel dull or squeezing, like a tight band or vice. ...
www.nlm.nih.gov/medlineplus/ency/article/003024.htm
headache ( ) n. A pain in the head. Informal . Something, such as a problem, that causes annoyance or trouble
www.answers.com/topic/headache