The following are some of the causes of low back pain after having sex: 1, due to excessive strength during sex, stimulation of the waist, resulting in a serious situation. 2, women suffering from gynecological inflammation, in the process of sex will lead to uterine congestion, so that the pelvic cavity is stimulated, the lumbar pulling pain and other symptoms, if not treated in a timely manner may lead to more serious problems of low back pain. 3, women who are often too tired, body weight, often do too much physical activity may lead to symptoms of low back pain. If a woman is often too fatigued, her body is heavily weighted, and she often does too much physical work, it may lead to lumbago, mainly because of various diseases such as lumbar muscle strain and lumbar disc herniation. At the same time, the stimulation of the lumbar region after sex can cause the disease to become more serious. If the back pain is serious, it is recommended to go to the hospital for specific examination and treatment.