Chronic pain is a wide term which generally used for the severe pain lasting more than 12 weeks. It can affect any part of the body at any stage of the lifespan.
Chronic pain may arise as the reaction of some injury, like a strain or sprain, or an ongoing illness may cause it. Even a fatigue or sleep disturbance may cause it. To treat the painful condition mostly physicians make a diagnosis first and then recommend proper painkiller medicines and self-managing techniques to get rid of the pain completely.