Chronic fatigue syndrome (CFS), also known as chronic fatigue immune dysfunction syndrome (CFIDS), is a disabling condition affecting approximately 500,000 Americans. Research conducted by the Centers for Disease Control and Prevention (CDC) indicates that fewer than 20% of CFS patients in the United States have even been diagnosed. Patients are usually women in their 40s and 50s, but anyone can develop CFS. Patients with CFS typically have a compromised immune system, elevated blood antibodies, intermittent sore throats, and tender lymph nodes. CFS can affect any part of the body, including the central nervous system, the brain, the blood, muscles, joints, the gastrointestinal tract, and the immune, digestive, and lymph systems.
According to a recent update from healthfinder.gov:
Health Tip: Warning Signs That You May Have Chronic Fatigue Syndrome
Here are possible symptoms
Chronic fatigue syndrome is characterized by extreme tiredness and a feeling of being worn out all the time, even after waking up. Its cause isn’t understood.