Fibromyalgia is chronic pain that can affect the entire body from headaches to pain in the lower extremities. This kind of pain is usually rare, and may only occur temporarily. In some cases, however, fibromyalgia gets worse over time and eventually becomes chronic. The cause of myofacial pain is often connected to TMD and disappears when it is treated. You might even be able to do without the lifetime of pain medication that sufferers of fibromyalgia often face.