4.5.1 Headache attributed to external application of a cold stimulus

A 29-year-old bakery assistant reports two separate episodes of head pain that she links firmly to walking into the shop's large chest freezer without a hat. On both occasions the pain began only once she was standing directly in the cold air of the freezer, and it did not occur at any other time. The head pain settled fairly quickly once she stepped back out and warmed her head under running water, resolving within about twenty minutes on each occasion. She describes the pain as a tight, band-like ache across the forehead rather than anything throbbing, with no nausea and no visual disturbance either time. Between episodes she is entirely well, with no other headache history of note.