Soreness after coitus can be considered whether it is the problem of cold, or muscle pain caused by overwork and endocrine disorders. It may also be due to pregnancy. 1. Cold: it may be caused by cold after intercourse, sex will overdraw physical strength, induced cold, will produce symptoms of weakness. It is recommended to pay more attention to rest, do not overwork. 2. Excessive exertion: there are two basic physiological reactions in the sexual response, vascular congestion and muscle tonus, muscle soreness is the consequence of muscle tonus. Muscle pain after intercourse is a normal reaction, after sex to pay more attention to rest, regular life. 3. Endocrine disorders: the human sympathetic nerves are in a state of high tension and excitement, hormone secretion, there may be a variety of problems caused by endocrine and other issues, it is recommended to go to the hospital for a relevant examination, pay attention to rest, and live a regular life. 4. pregnancy: female patients may be due to pregnancy after coitus, if it is early pregnancy, you can use test paper or pregnancy test stick test, generally show two bars is pregnant. It is recommended to go to the hospital in time when discomfort occurs.