IUD may be more painful than injections, but there are individual differences and the pain is usually within the tolerable range. IUD is an invasive operation, the whole process is relatively short, most women do not have obvious pain and discomfort during IUD, but there will be abdominal swelling and soreness, which is bearable by most patients. Some women who have not had children need to use a dilator to open the cervical canal, which will cause pain in dilation, and the process of IUD will also cause pain, but it will not be very serious. Some women are too nervous when they have the IUD, which may cause the pain to worsen, or the patient herself may feel strong pain when she is sensitive to pain. The best time for IUD is 3~7 days after menstruation, avoiding sexual intercourse, and those who are sensitive to pain can choose painless IUD, pay attention to hygiene after IUD, and follow the doctor’s instructions for anti-inflammatory treatment to prevent infection.