"Headache" is the word used in Engpsh to describe the condition of having a headache.
The word comes from the Old Engpsh "heafod-acǣġe."
Examples:
I have a headache.
(我头痛)
The headache medicine is not working.
(头痛药没有效果)
I get headaches often.
(我经常头痛)