 This study will last 12 weeks. Participants will be randomly assigned to one of three groups: active PMF pad treatment, sham PMF pad treatment, or standard of care, which may include drug therapy or physical therapy. Participants in the active and sham PMF pad groups will be treated with their assigned pad for approximately 8 minutes, twice a day for the duration of the study. Questionnaires and self-report scales will be used to assess pain, fatigue, sleep quality, mood, and inflammation episodes. Blood and urine collection will occur to assess levels of stress hormones and certain proteins. 