Chronic Fatigue Syndrome (CFS) is a complex disorder characterized by extreme fatigue that lasts for at least six months and is not improved by rest. This fatigue is often accompanied by other symptoms, such as sleep disturbances, cognitive difficulties, and muscle pain. The exact cause of CFS is unknown, but it may be triggered by infections, stress, or immune system issues. Diagnosis of CFS can be challenging, as there are no specific tests for it. Healthcare providers typically rely on patient history and symptom evaluation. Treatment focuses on managing symptoms and may include lifestyle changes, physical therapy, and medications to improve quality of life.