According to the third edition of the International Classification of Headache Disorders (ICHD), which terms this condition primary headache associated with<unk>  activity, it normally begins as a dull headache that increases with<unk>  excitement, and becomes intense at orgasm, which is called<unk>  benign headache. For some patients, the headache begins suddenly, often at orgasm, which is called orgasm headache. In two thirds of cases, it is bilateral, and unilateral in the rest. The pain lasts from one minute to 24 hours with severe intensity, or as long as 72 hours with mild intensity. Its occurrence is unpredictable, and may not follow every<unk>  act. Previous editions of the ICHD divided the condition into two subforms: preorgasmic headache and orgasmic headache. These subforms were merged into one entity with varying presentation because clinical studies could not distinguish them. Post-orgasmic headaches associated with posture may be better attributed to a spontaneous cerebrospinal fluid leak. Sudden, severe headaches during<unk>  activity may also be caused by intracerebral hemorrhage, subarachnoid hemorrhage, or cerebral infarction, which require immediate medical attention.
Sexual headache
External compression headache
Cold-stimulus headache
Orthostatic headache
Tension headache
Ictal headache
Lupus headache
Vascular headache