Headache and migraine affect more than 10 million people in the UK, two thirds of whom are women. They are one of the most common problems seen in doctors' surgeries and emergency departments, and are a leading cause of absenteeism at work and school, affecting a staggering 90,000 people each working day. Migraine attacks may include a range of manifestations such as nausea, vomiting and hallucinations, and may be so uncomfortable as to bring life to a halt. Headaches are usually less severe and more localised. There are a number of causes and triggers including lifestyle, diet, stress, and...