One of the mysteries of the English language finally explained.
The condition or fact of having a headache; aching or pain in the upper part of the head. Also as a count noun: a headache.
That causes the head to ache; (in extended use) that causes trouble, anxiety, or annoyance.
Late Middle English; earliest use found in Lanfranc's Science of Cirurgie. From head + aching, after headache<br>early 19th century; earliest use found in Fanny Burney (1752–1840), writer. From head + aching, after headache.
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