Hemicrania continua (HC) was first recognized and named by Ottar Sjastaad of Trondheim, Norway, and

Egilius Spierings of Boston, USA, in 1984 [1]. The authors initially considered the condition to be rare but it may be more common than they thought, with approxi-mately 100 cases reported in the literature [2, 3]. While it affects both men and women, it is twice as common in women, unlike cluster headache, another unilateral trigemino-autonomic cephalalgia which is over twice as common in men. It could be the most misdiagnosed of all the primary headache disorders, which are the headache conditions for which no organic cause is found. Clinically, HC presents as a unilateral headache that is continuous and usually of mild or moderate intensity. There may be added pain exacerbation periods of varying frequency consisting of severe headache that lasts for hours or days with associated migrainous and/or auto-nomic symptoms. There are two forms, the continuous form which accounts for 85 % of cases, and the relapsing and remitting form which accounts for the remaining 15%. The continuous form may start out as continuous or transform from the remitting form [2, 3]