Back pain in early pregnancy may be caused by the enlargement of the uterus and changes in hormone levels in the body. 1. Uterus enlargement: the uterus gradually enlarges after pregnancy, and the waist in order to overcome the protruding abdomen, it will be involuntarily backward, which may lead to pregnant women to appear in the early pregnancy waist pain back pain. 2. Hormone level changes: hormone level changes in early pregnancy, may lead to joint ligament laxity, and the uterus increases, will press the pelvic tissues and nerves, which will lead to pregnant women with early pregnancy back pain back pain. Back pain in early pregnancy may also be caused by peripheral neuropathy such as lumbar disc herniation and cervical spondylosis. If a pregnant woman experiences back pain in the early stages of pregnancy, it is recommended that she seek medical attention in a timely manner and under the guidance of a doctor, complete the relevant examinations to clarify the cause of the problem and take appropriate measures.