Fibromyalgia is a chronic disorder that causes pain and tenderness throughout the body, as well as fatigue and trouble sleeping. The pain associated with fibromyalgia is often described as a constant dull ache that has lasted for at least three months. The pain is likely to be continuous, although it may be better or more severe at different times. The pain could feel like an ache, a burning sensation, or a sharp, stabbing pain. Fibromyalgia-related pain is pain that causes you to ache all over. You may have painful "tender points," places on your body that hurt no matter what medication you take. Your muscles may feel like they have been overworked or pulled even though you havent exercised. Sometimes, your muscles will twitch. Other times they will burn or ache with deep stabbing pain. Individuals with fibromyalgia may also experience moderate to severe fatigue, difficulty sleeping, joint stiffness, headaches, tingling, numbness, or a burning or prickling sensation in hands and feet, painful menstrual periods, irritable bowel, and problems with thinking and memory. Fibromyalgia can make you extremely sensitive to pain all over your body, and you may find that even the slightest touch is painful. The stiffness may be most severe when you have been in the same position for a long period of time – for example, when you first wake up in the morning. Fibromyalgia can cause tiredness, which can range from feeling mildly tired to the exhaustion often felt during a flu-like illness. Severe tiredness (fatigue) may come on suddenly and can drain you of all your energy. If this happens, you may feel too tired to do anything at all. Fibromyalgia often co-exists with other conditions, such as irritable bowel syndrome, depression, or anxiety.