Chronic fatigue syndrome (CFS) and FM are alike in many ways. In fact, it is not uncommon for a person to have both FM and CFS. Some experts believe that FM and CFS are in fact the same disorder, but expressed in slightly different ways. Both CFS and FM have pain and fatigue as symptoms.
The main symptom of CFS is extreme tiredness. CFS often begins after having flu-like symptoms. But people with CFS do not have the tender points that people with FM have. To be diagnosed with CFS, a person must have:
- Extreme fatigue for at least 6 months that cannot be explained by medical tests
- Forgetting things or having a hard time focusing
- Feeling tired even after sleeping
- Muscle pain or aches Pain or aches in joints without swelling or redness
- Feeling discomfort or "out-of- sorts" for more than 24 hours after being active
- Headaches of a new type, pattern, or strength
- Tender lymph nodes in the neck or under the arm
- Sore throat
This answer is based upon source information from the National Women's Health Information Center.