Snoring can also cause headache. Snoring-induced headache is called sleep apnea headache, which refers to waking headache associated with obstructive sleep apnea (OSAS), and is classified as a secondary headache in the ICHD-II diagnostic classification under “headache and metabolic disorders”. Sleep apnea-induced waking headache accounts for a significant proportion of headache patients, including migraine, tension-type headache, cluster headache and other non-specific headaches associated with OSAS. One characteristic definition of the diagnostic criteria for sleep apnea headache is that the diagnosis of sleep apnea headache is not clear until sleep apnea is successfully treated. The definition and diagnostic criteria of sleep apnea headache need to be further validated and explored.