Sex is a normal physiological needs of adults, a reasonable and regular sex life can make both men and women relaxed and happy, but some middle-aged and elderly people after sex is very easy to appear back pain, causing serious impact on the quality of sex life, so to understand the causes of back pain after sex, only then can be targeted prevention and treatment. Click to read more What is happening to the back pain after sex? 1, too much sex life If the frequency of sex is too high, it is likely to appear after sex back pain, because sex is actually a relatively strenuous exercise, the frequency is too high may make the muscles of the lower back damage, so to reasonable sex, in general, within 7 days not more than twice. 2, lumbar muscle strain Due to some reasons lead to lumbar muscle strain, may also appear after sex back pain, because lumbar muscle strain will make the stability of the lumbar muscles become poor, if in this case sex, will bring a heavier burden to the lumbar back...