The main treatment for breakthrough bleeding is to take progesterone to antagonize the internal estrogen, which can effectively stop bleeding. If there is a lot of bleeding, it is necessary to scrape the uterus in time, which can effectively avoid the possibility of hemorrhage. Breakthrough bleeding is most common in women who have been taking oral contraceptives for a long time, who have missed doses or who are taking estrogen and progesterone to regulate hormone levels in the body, and who suddenly stop taking the drug, resulting in a sudden shedding of the uterine lining. Most of the bleeding is relatively small, but a very small number of women may experience heavy bleeding. Women taking sex hormone medications need to be especially careful to avoid taking the medication incorrectly, missing doses, or even stopping the medication suddenly. To avoid breakthrough bleeding caused by a sudden drop in progesterone levels, it is necessary to observe the amount of bleeding and whether there is any discomfort such as abdominal pain.