The symptoms of lower back pain after egg retrieval are mostly caused by the damage to the local tissues caused by the needles used in the process of egg retrieval. In some cases, it is due to the oozing of fluid during egg retrieval, which causes irritation to the tissues in the lower back, thus manifesting as back pain. In some cases, patients live or work for a long time in a cold and damp environment after egg retrieval and do not take effective measures to keep warm, which affects the lumbar tissues to a certain extent. Patients can have lumbar interspinous ligamentitis and other medical conditions can also appear to have low back pain, in female patients with lumbar disc herniation or lumbar degenerative disease and other medical conditions due to changes in the position of the egg retrieval, can not be ruled out will cause low back pain.