The causes of women’s back pain in the second half of the night mainly include the following aspects: the first aspect is considered to be caused by lumbar muscle strain of the organism. Mostly due to usually engaged in heavy physical labor or carrying heavy objects, resulting in lumbar muscle strain, which in turn causes lumbar soft tissue injury, pain. In the second half of the night, the pain is aggravated by the resting condition of the body, and then the pain is obvious. The second aspect is to consider that it is caused by lumbar intervertebral disc herniation. Mostly due to the usual lifting and holding heavy objects and other lumbar degeneration, lumbar disc herniation compression of the nucleus pulposus and so on, causing pain in the lumbar region. The third aspect is to consider that it is caused by urinary system diseases, including urinary stones or inflammation of the urinary system. Due to stone blockage, which in turn leads to the urinary system discharge is not smooth, causing back pain. Fourthly, it is considered to be caused by gynecological diseases of female comrades, including gynecological inflammation, pelvic inflammation, ovarian cysts, uterine fibroids and so on, which can be clarified through gynecological ultrasound examination.