This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A pain in the head.

n. Informal Something, such as a problem, that causes annoyance or trouble.

n. A pain or ache in the head.

n. A nuisance or unpleasant problem.

n. Pain in the head; cephalalgia.

n. A pain in the cranial part of the head, apparently somewhat deep-seated as compared with the sensation produced by a superficial irritation of the scalp.

n. The corn-poppy, Papaver Rhæas, the odor of which is said to cause headache. Also called head-wark.

n. pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs

n. pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs

n. something or someone that causes anxiety; a source of unhappiness

"a disordered stomach causes severe headache, known as _sick headache_."

ache    aching   

sick-headache    bilious headache    blind-headache    reflex headache    organic headache   

sinus headache    migraine    cluster headache    histamine headache    hemicrania    megrim    sick headache    tension headache   

cephalalgia    bother    pain in the neck   

nausea    fever    ache    fatigue    discomfort    insomnia    depression    cough    rheumatism    diarrhea