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Attacks of paroxysmal hemicrania occurring for more than one year without remission, or with remission periods lasting less than 3 months.
- Attacks fulfilling criteria for 3.2 Paroxysmal hemicrania, and criterion B below
- Occurring without a remission period, or with remissions lasting <3 months, for at least 1 year.
Patients who fulfil criteria for both 3.2.2 Chronic paroxysmal hemicrania (CPH) and 13.1.1 Trigeminal neuralgia (sometimes referred to as CPH-tic syndrome) should receive both diagnoses. Their recognition is important, since both disorders require treatment. The pathophysiological significance of the association is not yet clear.