3.4.2 Hemicrania continua, unremitting subtype

A 52-year-old taxi driver reports pain that sits strictly on the right side of his head, troubling him daily for about three months, on top of a pattern that by his account stretches back nearly a year. During flare-ups his right nostril blocks up completely, which he initially put down to hay fever. The background pain is severe most days, sharp enough that he has had to pull over while driving on occasion. He describes brief patches of easier pain, though none has ever stretched to a full day - at most about twenty-three and a half hours by his own timing. After a course of an anti-inflammatory drug at treatment dose, the pain went away entirely within days of starting it.