In the second trimester of pregnancy, due to the growth and development of the embryo in the uterine cavity, the enlarged uterus compressing the pelvic cavity may lead to lumbago. If there is no lower abdominal pain or vaginal bleeding, the symptoms of lumbago can be properly relieved by proper bed rest and massage of the lumbar region. If a woman has lumbago in the second month of pregnancy and the lowering is more obvious and cannot be relieved after proper rest, it is better to go to the hospital for gynecological ultrasound examination and determination of blood HCG and progesterone. If the embryo is developing well and there is no pre-miscarriage, pay attention to proper rest, which will not affect the growth and development of the fetus. If the lower back pain is more obvious and the progesterone is lowered, women need to give progesterone drugs for fetal preservation treatment and review it after two weeks to avoid affecting the growth and development of the fetus.