Early pregnancy back pain may be caused by the enlargement of the uterus, and may also be caused by preeclampsia, lumbar muscle strain, ureteral stones and other diseases. 1. Physiological factors: In early pregnancy, the fetus will gradually develop, and some women will suffer from pelvic congestion, lumbosacral pain and other discomforts due to the enlargement of the uterus. Most of the above situations will get better gradually and do not require special treatment. 2. Pre-eclampsia: In the early stage of pregnancy, due to the unstable development of the fetus, when it is attacked by external toxic and harmful substances, or genetic defects of the fetus, or the mother is too emotional, it may lead to pre-eclampsia. Patients with preeclampsia will show lumbosacral pain, abdominal pain and vaginal bleeding. 3. Lumbar muscle strain: Early pregnancy women, there may be a long time physical labor behavior, resulting in lumbar muscles produce aseptic inflammation, edema, pain and other uncomfortable symptoms. Early pregnancy back pain has more causes, it is recommended to go to the hospital in a timely manner to check, clear the cause of the disease and follow the doctor’s instructions to deal with the treatment, so as not to lead to other serious consequences.