Placement of the Mannix ring may cause one to gain weight. The Mannix itself is a highly effective progestin, and women who are sensitive to progesterone can experience weight gain. The Mannix ring contains a large amount of progesterone, and the placement of the Mannix ring in women who are sensitive to progesterone can cause water and sodium retention and increase appetite. There will be signs of redness and weight gain. If you do not control your diet, you may gain weight due to increased appetite. The weight gain usually stops after removal of the IUD, but if the diet is not controlled, weight gain is often difficult to avoid. It is recommended to control diet and strengthen physical exercise after placing the Mannix Ring to avoid gaining weight. If the weight gain persists, there may also be pathological factors, and it is recommended to consult a doctor in time.