Cluster headaches are the most common of the trigeminal autonomic cephalalgias as defined by the International Headache Society
Tension headaches are the most common type of primary headache disorder seen in practice, and perhaps the most misunderstood
Migraine is a complex neurophysiological disease characterized by episodic, and sometimes chronic, and progressive forms of headache.
Early hypotheses of headache pain focused on peripheral mechanisms. These include extracranial muscle contraction and vascular dilation