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Paroxysmal hemicrania is a rare form of headache that usually begins in adulthood. Patients experience severe throbbing, claw-like, or boring pain usually on one side of the face; in, around, or behind the eye; and occasionally reaching to the back of the neck. This pain may be accompanied by red and tearing eyes, a drooping or swollen eyelid on the affected side of the face, and nasal congestion.

Reference : by the National Institute of Neurological Disorders and Stroke (NINDS), https://www.ninds.nih.gov/Disorders/All-Disorders/Paroxysmal-Hemicrania-Information-Page, july 3rd,2019

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