<unk>  must be properly distinguished from cluster headaches, since cluster headaches also occur several times per day with separate attacks, and share some common symptoms. However, cluster headaches usually last longer (up to three hours), occur less often (three to five attacks per day), and do not accompany cranial autonomic symptoms. IHS standard criteria for the diagnosis of<unk>  specifically includes pain in the trigeminal division of the face, especially in the orbital region, often with cranial autonomic symptoms which last for relatively short periods of time (from five seconds to several minutes) up to 100 times per day.<unk>  is a major subset of SUNA, which does not accompany cranial symptoms; complete separation between the two is inappropriate since<unk>  does not necessarily always accompany cranial autonomic signs. Exact statistical data is not available due to common mis-diagnosis, and setting up diagnostic criteria is important. The International Headache Classification established by the International Headache Society criteria for diagnosing<unk>  for therapeutic purposes is: :(i) Type of attack – Attacks of unilateral orbital, supraorbital, or temporal areas from stabbing or pulsating pain accompanied by ipsilateral conjunctival injection and lacrimation :(ii) Number of attacks per day – 3 to 200 attacks per day :(iii) Attack load in minutes per day – 5–240 seconds Symptoms of<unk>  often lead to misdiagnosis as paroxysmal hemicrania, which is also categorized in the same group. Inefficiency of indomethacin usually indicates<unk>  over paroxysmal hemicrania. Misdiagnosis and indecisive diagnosis in the past has made it difficult to obtain accurate statistics about<unk> . Proper diagnosis will broaden data availability and facilitate discovery of new treatment options and useful statistics.
SUNCT syndrome
MASA syndrome
SAHA syndrome
Hopkins syndrome
TAN syndrome
EAST syndrome
Crome syndrome
Bogart–Bacall syndrome