Diagnostic criteria:
  1. Either of the following:
    1. a single headache episode fulfilling criteria B-D
    2. at least two headache episodes fulfilling criterion B and either of criteria C and D
  2. Brought on by and occurring only in association with coughing, straining and/or other Valsalva manœuvre
  3. Sudden onset
  4. Lasting between 1 second and 2 hours
  5. Not fulfilling ICHD-3 criteria for any other headache disorder
  6. Not better accounted for by another ICHD-3 diagnosis.