[The characteristics of sinus headache resembling the primary headaches].

It has to be excluded organic lesions to diagnose the primary headache, however they are tended to be misdiagnosed in a routine practice. Acute sinusitis is the most common disease to be misdiagnosed as the primary headaches and we have reported that the characteristics of sinus headache have closely resembled migraine, cluster headache or tension type headache. The effectiveness of triptans does not become an evidence for a diagnosis of migraine or cluster headache, because it was also effective for the pain of the acute sinusitis. The etiology of sinus headache that resembles the primary headaches is similar to the trigemino-vascular theory. In this paper, we clarify the characteristics of sinus headache resembling the primary headaches.