The main precautions for sclerotherapy injection are: First, the dose should be sufficient for the first injection, and a small amount of multiple injections is appropriate. Second, in the process of sclerotherapy injection or after the operation, the patient needs to be repeatedly asked whether there is pain, timely adjustment of the injection site. Third, before the sclerotherapy injection again, must first rectal examination, to understand the situation before deciding whether to perform another injection. C. One day after sclerotherapy injection, defecation is prohibited. 4. The site of sclerotherapy injection should not be too deep. Five, the diagnosis of unknown swelling, temporarily not sclerotherapy. Close observation of the patient’s urine and stool, and changes in vital signs is required after injection.