Hemicrania continua is a trigemino-autonomic cephalalgia. However, unlike cluster headache or paroxysmal hemicrania, hemicrania continua is characterised by a daily and continuous head pain on one side of the head with superimposed exacerbations of a more severe headache which are often associated with typical facial symptoms namely eye watering, eye redness, runny nose or stuffy nose. Because of the daily head pain, sometimes this condition is misdiagnosed with migraine, sinus headache or a neck problem. Hemicrania continua is exquisitely sensitive to indometacin, a potent painkiller that at the right dose should control the headache completely. Long-term preventive treatments other than indometacin may be required.