Table 2.

International classification of headache disorders [1]

Thunderclap headache	Abrupt onset, reaching maximum intensity in < 1 min Lasting for ≤ 5 min
Cough headache	Sudden onset Brought on by, and occurring only in association with, coughing, straining and/or other Valsalva manœuvres Lasting between 1 s and 2 h
Exercise headache	Brought on by, and occurring only during or after, strenuous physical exercise Lasting < 48 h
Headache associated with sexual activity	Brought on by and occurring only during sexual activity Either or both of the following: 1. Increasing in intensity with increasing sexual excitement 2. Abrupt explosive intensity just before or with orgasm Lasting from one minute to 24 h with severe intensity and/or up to 72 h with mild intensity

The assumption of a primary disorder is recurrence (> 1 attack) with no evidence for an alternative secondary precipitating pathology