headache

n. pain in the head

A headache (cephalgia in medical terminology) is a condition of pain in the head; sometimes neck or upper back pain may also be interpreted as a headache. It ranks amongst the most common local pain complaints.The vast majority of headaches are benign and self-limiting. Common causes are tension, migraine, eye strain, dehydration, low blood sugar, and sinusitis. Much rarer are headaches due to life-threatening conditions such as meningitis, encephalitis, cerebral aneurysms, extremely high blood pressure, and brain tumors. When the headache occurs in conjunction with a head injury the cause is usually quite evident. A large percentage of headaches among females are caused by ever-fluctuating estrogen during menstrual years. This can occur prior to, during or even midcycle menstruation.
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A headache involves pain in the head which can arise from many disorders or may be a disorder in and of itself. [more]Headache - Community and Resources

Noun
1. something or someone that causes anxiety; a source of unhappiness; "New York traffic is a constant concern"; "it's a major worry"
(synonym) concern, worry, vexation
(hypernym) negative stimulus
(hyponym) bugaboo
2. pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
(synonym) head ache, cephalalgia
(hypernym) ache, aching
(hyponym) histamine headache, cluster headache

(n.)
Pain in the head; cephalalgia.