This is a 24 months multicenter (2 recruiting centers, 1 care center), randomized, and placebo-controlled study. The purpose is to evaluate the analgesic efficacy of a 6 weeks osteopathic treatment compared to a 6 week standard treatment on patients with fibromyalgia. It includes 6 osteopathic/standard sessions of 20 minutes (of one week apart), a follow-up at 3 months, 6 months and 12 months.