Chronic fatigue syndrome (CFS) is a condition characterized by unexplained debilitating fatigue that lasts for at least six months and is accompanied by four or more symptoms: Post exertional malaise or extreme exhaustion after physical or mental exercise that lasts for more than 24 hours Poor concentration and impaired short term memory Sleep disturbance Musculoskeletal pain Tender lymph nodes Headaches Sore throat Anxiety and depressive disorders Since CFS with its complex symptoms has no clear mechanism treatment options and effectiveness are limited and vary from person to person. What may be effective for you may not be the right option