In preparation for a fully powered randomized controlled clinical trial of MBSR for patients with moderate-to-severe migraine headache, the investigators propose a detailed pilot/feasibility study to develop and test the clinical research methods required for a successful Phase III trial. The investigators will first identify a large number of migraineurs in the Northern California-based Sutter Health system using analytic tools previously developed by the group. Next, using latent class analysis, the investigators will identify subgroups of migraine patients defined by comorbidities. The investigators will then enroll 60 patients with a pattern of 4-14 headaches per month and randomize them to a full 9-week MBSR intervention with usual care or usual care alone, with follow-up at 4 months. The primary clinical outcome is change in headache frequency at 4 months, with several secondary outcomes, including assessments of pain, quality of life, and functional status.