The pain mainly depends on which part of the body is in pain. The pain in the whole body, for example, may be caused by the following reasons: 1. excessive exercise leading to muscle pain, may be due to long-term non-exercise, sudden mass exercise or irregular exercise, causing the accumulation of lactic acid in the muscles, resulting in muscle pain. 2. no good rest, the patient sleeps in a poor environment, causing insomnia, resulting in body pain and discomfort. 3, Cold and flu, most patients with cold and flu will have symptoms of generalized pain and weakness. 4, overwork, some patients engaged in heavy physical labor, will have body pain.