Depending on their age, physical fitness and working environment, some women may experience physiological discomfort such as swelling, soreness and strain in the lower abdomen during the first week of pregnancy. This is especially true for older women and those with multiple pregnancies. With the liberalization of the two-child policy and the increase of assisted reproduction (IVF) patients in infertility lines, the number of advanced maternal age and multiple pregnancies has increased significantly, and the number of patients with back pain in early pregnancy has increased significantly. Back pain in early pregnancy is mostly a physiological discomfort caused by pregnancy and is a normal physiological phenomenon. It is a normal physiological phenomenon. Early pregnancy may cause lumbago due to embryonic implantation, strain on the uterine ligaments, and accelerated metabolism due to changes in hormone levels in the body. It is short-lasting, aggravated by exertion, and relieved by resting on a flat surface. At this time, you should avoid bending, squatting and other movements, pay attention to maintenance and prevent cold. If the above symptoms persist for a long time and get worse gradually, or are accompanied by a little vaginal bleeding, the possibility of pre-eclampsia or ectopic pregnancy cannot be ruled out and immediate hospital examination is needed to clarify the diagnosis; if the blood HCG level is unsatisfactory and the ultrasound of early pregnancy indicates a normal intrauterine gestational sac with intrauterine liquid dark area, pre-eclampsia can be diagnosed and fertility preservation treatment is feasible; if the blood HCG value rises and the ultrasound reveals a mass in one of the fallopian tubes and there is no fetal sac in the uterus, the diagnosis of pre-eclampsia is highly suspected. If the blood HCG value rises and the ultrasound reveals a mass in one of the fallopian tubes without a fetal sac, ectopic pregnancy is highly suspected and requires hospitalization for chemotherapy or surgery. Some women may experience back pain during the first week of pregnancy, which is generally mild and short-lived and can be relieved after lying down and resting, and does not affect their work and life.