The dangers of menstrual cups: 1. the small volume may cause women to overflow menstrual blood during heavy periods. 2. it may also cause damage to the vaginal wall or lead to vaginal bacterial infection due to repeated insertion into the vagina and other gynecological inflammatory diseases. 3. the quality of menstrual cups cannot be adequately guaranteed, as menstrual cups are made of silicone and are placed deep into the vagina during menstruation to collect menstrual blood. The cups are made of silicone and are placed deep inside the vagina to collect menstrual blood from the uterine cavity. During menstruation, it is best for women to use quality-assured sanitary napkins, which can be changed at any time and are less likely to cause vaginal infections. Women should also pay attention to warmth and rest during menstruation, keep the vulva clean and hygienic, and try not to use menstrual cups to avoid discomfort to the body.