“I’ve come to see you about my headache.” It’s a phrase that leaves many GPs with a feeling of dread. Headache is a bit of a nightmare. Most people with a severe or new headache are terrified about the worst case scenario: Cancer. Doctors worry about missing other critical headaches and, once they’ve been ruled out, trying to reassure the patient that the headache is unlikely to be sinister but…what do they do about it? What’s the diagnosis?