There are several reasons for back pain after sex: 1, improper sex, including sex too often, sudden interruption of sex, too much movement during sex, etc.; 2, kidney deficiency, frequent sex when the body is weak is easy to make the kidney loss, in addition to lumbago will also appear seminal emission, cold libido symptoms; 3, waist problems, such as herniated disc, disc malformation, lumbar muscle strain, etc., intercourse After that, it is more likely to overburden the waist, which is not so good, so that the back pain; 4, urinary system diseases, if men suffer from urethritis, urinary system infection, pelvic organs will also be implicated, which will cause back pain. There are more reasons for back pain after sex, you need to go to the hospital for examination, after the diagnosis according to the doctor’s advice to live a good married life, remember not to make up your own mind.