Increased prolactin does not usually cause endometrial polyps. However, it should be seen promptly for further examination. High prolactin may be caused by skull base tumors or polycystic ovary syndrome hypothyroidism. The role of prolactin is mainly to promote the development of female mammary glands, and it can also regulate immunity. Endometrial polyps are caused by localized overgrowth of the endometrium. The thickness of the endometrium usually shows cyclic changes, the main reason is the hormonal cycle changes, which are divided into three phases. Menstrual phase: estrogen and progesterone levels drop and the endometrium sheds and thins; proliferative phase: estrogen causes the endometrium to proliferate; secretory phase: estrogen causes the endometrium to continue to thicken. In summary, prolactin does not cause endometrial polyps. Endometrial polyps are usually closely related to estrogen levels.