Bleeding while taking progesterone may be caused by normal phenomenon, failure of birth control, cervicitis and other reasons. It is recommended to go to the hospital in time for examination to clarify the cause. 1. Normal phenomenon: the correct use of progesterone can help replenish the body’s lack of progesterone, thus helping to raise the level of hormones, if taking progesterone bleeding, then it may be a normal phenomenon, usually caused by the drug components to make the endometrium stripped. 2. Failure of birth control: progesterone is a kind of drug to enhance the progesterone, if the use of progesterone drug method is wrong, then it may not be able to play a role in enhancing the role of progesterone, which may lead to the failure of birth control, resulting in taking progesterone bleeding, may also be accompanied by abdominal pain symptoms. 3. Cervicitis: Bleeding while taking progesterone may be caused by cervicitis, which affects the cervix and can be congested and edematous for a long time, and under the action of the drug, it may lead to stimulation of the cervix, thus causing symptoms. The use of progesterone is recommended to follow the doctor’s instructions, if there is discomfort or abnormalities during the period, you need to communicate with your doctor in a timely manner.