After getting an IUD, many women experience prolonged periods, especially when they first get their periods, and the menstrual volume is very small and dark. This is because after the IUD is placed inside the uterus, when menstruation comes, the endometrium is not shed completely, but only partially and rarely, and the endometrium surface that the IUD touches is shed slowly, which will lead to the decrease of menstrual volume and black menstruation. As the IUD lasts longer, this symptom will slowly decrease. After the uterus has adapted to the IUD, the menstrual flow will slowly return to normal. Therefore, after this happens, you must pay attention to rest, do not eat cold, spicy and stimulating food during menstruation, and pay attention to the warmth of your belly and do not get cold.