Male coitus the next day after the lumbar pain, common causes are as follows: First, in the process of sexual life, the use of lumbar force instead of hip force, resulting in lumbar muscle strain, causing lumbar pain symptoms, the lack of power of the hip muscles, can only be through the use of the lumbar muscle power to carry out sexual life, this is with the usual almost no exercise hip muscles related to strengthen squatting and hard pulling training, strengthen the power of the hip muscles can be Avoid lumbar muscle strength, and prevent the occurrence of lumbar pain symptoms; second, after sex without paying attention to lumbar warmth, resulting in lumbar muscle cold, can also cause lumbar pain symptoms, lumbar muscle stiffness, spasms, localized hot compresses can alleviate the symptoms of lumbar pain, and usually should pay attention to the protection of the lumbar region and pay attention to keep warm.