Mid-pregnancy lumbar pain with secretion is divided into physiological and pathological reasons, physiological reasons can be seen in the rapid development of the fetus, uterine enlargement compression of the lumbar vertebrae and other factors; pathological reasons can be seen in gynecological inflammation, aura of miscarriage and other factors. 1. Physiological reasons: mid-pregnancy back pain may be due to the rapid development of the fetus, the uterus increases the compression of the lumbar spine and caused by local hot compresses, more rest to ease. Discharge is generally related to the increase in vaginal and cervical glandular secretions caused by the increase in hormone levels and metabolism during pregnancy, and there is generally no odor and itching discomfort. The phenomenon of back pain and discharge is a normal reaction to pregnancy and does not require special treatment. 2. Pathological causes: mid-pregnancy back pain and secretions may also be abnormal symptoms, mostly related to gynecological inflammation or aura of miscarriage. (1) gynecological inflammation: if a woman suffers from pelvic inflammatory disease or adnexitis and other gynecological diseases, inflammatory stimulation leads to increased pelvic congestion, there will be back pain and discomfort, and accompanied by increased discharge, odor and other phenomena, can be combined with gynecological ultrasonography and secretion tests and then given treatment. (2) Aura of miscarriage: mid-pregnancy back pain with discharge may also be due to maternal disease or external factors such as the influence of the aura of miscarriage, there will be obvious lumbar pain, abdominal pain and increase in vaginal discharge phenomenon, and even brown discharge or bleeding phenomenon, need to do ultrasound in time to give birth control treatment.