Finally, there are instances when a progesterone-based hormone therapy might be used in the treatment of trans men. Progesterone may be used in some instances to help stop menstrual flow if testosterone therapy alone does not adequately stop the cycle after a reasonable period of treatment. A short course of progesterone may also be prescribed to induce a shedding of the uterine lining after testosterone therapy has progressed, in the event that there is any unusual buildup of the endometrium. This may help prevent spot bleeding as well as potentially decreasing the risk of uterine cancer. To learn more specifics about FTM testosterone therapy, please read the sections " FTM Testosterone Therapy Basics " and " FTM Testosterone Therapy and General Health ."