Participate in a migraine trial study! Migraine patients are invited to participate as outpatient subjects in a trial study investigating the effect of caffeine abstinence on migraine headaches. The study period lasts 24 days: a ten day base period, four days of self-imposed weaning from caffeine, and ten days of self-imposed caffeine abstinence. Subjects will record the date and severity of any headaches they get during the study period. To participate, send an email expressing interest to barryspencer@caffeineandmigraine.com