Informal Something, such as a problem, that causes annoyance or trouble.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "headache" in a sentence
"What is called "_sick headache_," or "nervous headache," begins by a sense of blindness or blur, before the eyes, of green or purple colors, dazzling or swimming in the head, without, for some time at first, any positive aching or pain."
"a disordered stomach causes severe headache, known as _sick headache_."
"God's sake, the headache is the most common medical condition plaguing human beings!"