If you're reading this, you or someone you know is likely suffering from chronic fatigue syndrome (CFS). It's a debilitating condition that makes even the most basic tasks appear impossible. Physical, mental, or both types of fatigue can last for months or even years. Experts define CFS as fatigue that lasts longer than six months and is not relieved by rest by rest. Other symptoms may include pain, sleep problems, and difficulty concentrating. Infections, autoimmune diseases, and mental health disorders can all contribute to CFS. Lifestyle factors such as stress, poor diet, and lack of exercise can also cause CFS. If you are suffering from CFS, you should seek medical help to rule out any underlying causes. Following a CFS diagnosis, treatment will focus on symptom management and improving lifestyle factors. Most people suffering from CFS can improve their quality of life with proper treatment.