Cluster headaches occur primarily in men, while CPH is more commonly diagnosed in women. The female to male ratio of diagnosed patients can range anywhere from 1.6:1 to 2.36:1. Symptoms may begin to appear at any age, but onset usually occurs in adulthood with a mean starting age within the thirties. History
CPH was discovered by Norwegians Ottar Sjaastad and Inge Dale in 1974. The term chronic paroxysmal hemicrania was first used in 1976 by Sjaastad to describe a condition seen in two of their patients who were experiencing repeated solitary and limited daily headache attacks on only one side of the cranium.It is possible that chronic paroxysmal hemicrania was first described by Johann Oppermann in 1747 under the term "hemicranias horologica". Oppermanns report included a 35-year-old woman who had hemicranial pain that lasted for 15 minutes and recurred regularly every hour.CPH has been included in the International Headache Societys classification system since 1988. See also
Hemicrania continua
Rebound headaches
Tension headaches
Trigeminal neuralgia

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Because of the variability in severity and progression of the disease, doctors will not be able to give a definite prognosis. A period of experimentation with different treatment regimens is likely to be necessary in order to discover the most appropriate treatment regimen for a given patient. Epidemiology
In 1982 Lewis et al. reported a group of patients with a chronic asymmetrical sensorimotor neuropathy mostly affecting the arms with multifocal involvement of peripheral nerves. Also in 1982 Dyck et al reported a response to prednisolone to a condition they referred to as chronic inflammatory demyelinating polyradiculoneuropathy. Parry and Clarke in 1988 described a neuropathy which was later found to be associated with IgM autoantibodies directed against GM1 gangliosides. This latter condition was later termed multifocal motor neuropathy This distinction is important because multifocal motor neuropathy responds to intravenous immunoglobulin alone, while chronic inflammatory demyelinating polyneuropathy responds to intravenous immunoglobulin, steroids and plasma exchange. It has been suggested that multifocal motor neuropathy is distinct from chronic inflammatory demyelinating polyneuropathy and that Lewis-Sumner syndrome is a distinct variant type of chronic inflammatory demyelinating polyneuropathy.The Lewis-Sumner form of this condition is considered a rare disease with only 50 cases reported up to 2004. A total of 90 cases had been reported by 2009. Vaccine injury compensation for CIDP
The National Vaccine Injury Compensation Program has awarded money damages to patients who came down with CIDP after receiving one of the childhood vaccines listed on the Federal Governments vaccine injury table.