There is no definitive diagnostic test for hemicrania continua. Inefficiency of indomethacin usually indicates SUNCT over paroxysmal hemicrania. Triptans and other abortive medications do not affect hemicrania continua. Hemicrania continua (HC) is a persistent unilateral headache that responds to indomethacin. Paroxysmal hemicrania is classified by the frequency and duration of attacks experienced by patients.