Migraine is an episodic, neurological disorder primarily manifesting as debilitating headaches with or without associated symptoms such as photophobia, phonophobia or both. A Roman physician, Gael, first described the disorder using the term hemicrania and later by a 16th century Scottish poet, William Dunbar, as magryne, who further developed the disease criteria. Despite its historical origins, due to the lack of clinical evidence and its invisible nature, migraine has been largely discredited since the 18th century.