Adverse effects of IUD are as follows: 1. The most common is irregular vaginal bleeding, because the IUD is a foreign body to the uterine lining, and the uterine lining has to adapt to the process after the IUD is inserted, which will lead to rejection and vaginal bleeding, and this phenomenon will disappear when the uterine lining is adapted to the presence of the IUD. 2. Some people may have lower abdominal pain, which is also due to the stimulation of the IUD causing uterine contraction, which will lead to lower abdominal pain. 3. Stimulation of the uterus causes contractions, which can lead to pain in the lower abdomen, when adapted to the birth control ring, this situation will disappear. 3, the birth control ring may be dislodged, dislocated, or the birth control ring embedded in the situation, after the implantation of the ring, once the lower abdomen pain, vaginal bleeding, and timely examination and should also be done annually for the position of the ring check.