The classification of headache.
The definition of headache syndromes in the past have lacked precision, not only because different terms have been used for the same condition, but also because there is no general agreement on the essential characteristics of each. Since even minor variations will produce marked differences in case series purporting to be of the same disorder, it is important to get general agreement and to improve on previous classifications of headache.
D003027:Cluster Headache / Q000145:classification; D013700:Giant Cell Arteritis / Q000145:classification; D006261:Headache / Q000145:classification* / Q000209:etiology; D006801:Humans; D008881:Migraine Disorders / Q000145:classification; D009119:Muscle Contraction; D013315:Stress, Psychological / Q000150:complications; D013577:Syndrome