The second day after male intercourse lumbar pain, the common reasons are as follows: first, in the process of sex, the use of waist strength instead of hip force, resulting in lumbar muscle strain, causing lumbar pain symptoms, hip muscle strength is not enough, only through the use of lumbar muscle strength in order to have sex, this is related to the usual almost no exercise hip muscles, strengthen the deep squat and hard pull training, enhance the strength of the hip muscles can Avoid lumbar muscle borrowing and prevent lumbar pain symptoms from occurring; secondly, not paying attention to lumbar warmth after sex, resulting in cold lumbar muscles, which can also cause lumbar pain symptoms, lumbar muscle stiffness and spasm, local hot compresses can relieve lumbar pain symptoms, usually should also pay attention to protecting the lumbar area and pay attention to warmth.