Chronic daily headaches are defined as headaches which occur at least 15 days or more per month for at least three months, regardless of the underlying headache aetiology.
In addition to migraine, tension-type headache and trigeminal autonomic cephalalgias, the International Headache Society includes a fourth category of primary headache disorders.
The trigeminal autonomic cephalalgias. Besides cluster headaches, there are three other trigeminal autonomic cephalalgias
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
Headache is a symptom. Headache may be a primary, such as cluster headache, or secondary to another issue, such as a brain tumour