Chronic Fatigue Syndrome is a disease characterized by profound fatigue, sleep abnormalities, pain, and other symptoms that are made worse by exertion. There are about 200,000 cases of CFS in the US. It’s common in teens and adults. It’s very common for children to have CFS. About 90 percent of people are diagnosed with CFS, but around 836,000 and 2.5 million Americans suffer from CFS. Some people with CFS often describe the experience as a “crash,” “relapse,” or “collapse,”. CFS individuals are in wheelchairs, housebound, or bedbound, due to the severity of their symptom burden. People with CFS experience a period of immobilizing physical and/or mental fatigue. This often happens when a person is "overloaded" physically, mentally or emotionally.The main symptom is of course fatigue, but it is so severe it impacts a person’s everyday life and is more than simply being tired. Those with the condition experience extreme fatigue from the completion of physical and mental activities as well as being at a high risk of developing insomnia and numerous other kinds of sleep disorders.