Sacral cysts are benign diseases and are not fatal in themselves, but they may cause other complications fatal in seriously ill patients due to prolonged bed rest and inadequate care. Sacral canal cyst is not a tumor lesion, there is no benign or malignant, and metastasis will not occur. However, when the sacral cyst is serious, it may compress the nerve roots and cause numbness in the perineal area, buttocks, sacrococcygeal area, calves and other parts of the body, as well as abnormal urination and defecation and perianal pain. The prognosis is usually better and the patient’s life expectancy is basically unaffected, no different from that of normal people. If the patient is not treated in time, the course of the disease is longer, and the cyst compresses the peripheral nerve for a long time, it may lead to serious complications, such as causing numbness and weakness of the lower limbs and causing venous thrombosis, and if the thrombus is dislodged, it may lead to pulmonary embolism, which may endanger the patient’s life if not treated in time. Therefore, patients with sacral cysts should be reviewed every six months or once a year, and if the cysts are found to be continuously enlarged or the condition is more serious, they should be actively treated with surgery.