<unk>  may be classified according to international<unk>  society(IHS) into two groups: primary and secondary.Based on the duration of symptoms,<unk>  may be classified as either acute or chronic.There are five types of<unk> : vascular, myogenic (muscle tension), cervicogenic, traction, and inflammatory.
Headache classification
Dizziness classification
Migraine classification
Amnesia classification
Syncope classification
Delirium classification
Anxiety classification
Otalgia classification