The round IUD is one of the more common IUDs and is a safe, effective and good IUD. The goodness of the IUD does not depend on the shape of the ring, but has to do with whether it can achieve effective contraception. In addition, it has something to do with whether there will be any adverse effects on the body after the IUD is put on, for example, some people are allergic to copper, so the drug allergic reaction that will occur after the copper-containing IUD is put on. This kind of IUD is an inappropriate IUD for him. There are also some people who may experience discomfort in the lower abdomen due to the stimulation of foreign objects or discomfort due to inflammation of the uterine lining, resulting in constant vaginal bleeding after having the IUD, which is not suitable for them.