Women’s back pain after coitus, no strength has several reasons: first, consider gynecological inflammation, if you suffer from pelvic inflammatory disease, endometritis will lead to pelvic congestion, abdominal pain, lumbar pulling pain, will also trigger fatigue. Secondly, it is considered that sex is too frequent, women often have sex will lead to a lack of physical strength, long-term will lead to kidney deficiency, which will lead to back pain. Once again, consider lumbar muscle strain, lumbar disc herniation, long-term sedentary, long standing or carry out too heavy physical work, when the body is overburdened, it will lead to lumbar injury, which will lead to lumbar pain. Pay attention to nursing care, more rest, do not often have excessive sex, pay attention to control sexual desire, appropriate physical exercise.