Fibromyalgia is a disorder that causes muscle and connective tissue pain. Although the cause of fibromyalgia is unknown, the pain is still very real. Most people with fibromyalgia suffer from chronic pain, severe fatigue, muscle spasms, and weakness in the limbs. The treatment for this disorder varies from aerobic workout to prescribed medicine. Surprisingly however, people who have fibromyalgia have been known to work with water to alleviate pain and muscle spasms.