头痛用英语可以说成"headache"。它的来源是来自于英语中的单词"head"（头）和"ache"（疼痛）。例如：

I have a headache. (我头痛。)

She gets headaches often. (她常常头痛。)

His headache was so severe that he had to lie down. (他的头痛非常严重，以至于他不得不躺下来。)