There are many reasons that cause back pain after sex, if sex is more frequent, it is normal to have back pain. Frequent sexual life is equivalent to exercise, too much exercise will naturally appear back pain and other situations. If the number is not much, but every time after sex appears lumbar pain and so on, in Chinese medicine is considered a kidney deficiency caused by kidney deficiency lumbar pain. In Chinese medicine, it is too much intercourse, causing lumbar pain, painful soreness and weakness. Kidney deficiency is mostly accumulated into disease, need to be adjusted, warming the kidneys to help Yang, blood circulation drugs to regulate. Secondly, if the number is not much, normal kidney function still appear lumbar pain, consider the environmental factors. Such as lack of oxygen, dryness, etc. The above content is for reference only, please refer to the doctor’s face-to-face guidance for specific medication and treatment.