HEADACHE
concern, worry, headache, vexation
(noun) something or someone that causes anxiety; a source of unhappiness; “New York traffic is a constant concern”; “it’s a major worry”
headache, head ache, cephalalgia
(noun) pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
Source: WordNet® 3.1
Etymology
Noun
headache (plural headaches)
A pain or ache in the head.
(figurative) A nuisance or unpleasant problem.
Synonyms
• (physical pain): cephalalgia
• (annoyance): bother, pain in the neck
Hyponyms
• hemicrania
• migraine
• megrim
• tension headache
Source: Wiktionary
Head"ache`, n.
Definition: Pain in the head; ceph "Headaches and shivering fits."
Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition