Participants will be treated according to their individual pain problem. Treatments may include medicines, exercises, physical therapy, nerve blocks and dietary changes. Medicines given in this study are commonly used by doctors to treat pain, but for many, there is little research to back up their use. This study will provide information on the effectiveness of these treatments. Participants will keep a daily log in which they rate their pain, record any procedures they undergo outside the study, such as injections and exercises, and record medication side effects.