There are many factors that can cause vaginal bleeding and it is always advisable to seek medical attention to find the cause of the bleeding and treat the symptoms. The first thing to rule out is normal vaginal bleeding i.e. menstruation. The cyclic shedding of the endometrium each month forms menstruation. Secondly, it is important to observe whether the vaginal bleeding is at the same time as the previous menstrual cycle and also to observe the color of the bleeding as well as the amount of bleeding to consider whether it is irregular vaginal bleeding. There are several causes: 1. Irregular bleeding after menopause. In women of childbearing age, pregnancy-related diseases such as miscarriage and ectopic pregnancy are mostly considered; in postmenopausal women, malignant tumors are more likely. 2. Irregular vaginal bleeding in the menstrual cycle. It is often dysfunctional uterine bleeding, but endometrial cancer should be excluded first. 3.Post-coital bleeding. Mostly cervical erosion, cervical polyps, etc. 4.Intermenstrual bleeding. When it occurs between two menstrual periods, lasts for 3-4 days and the blood volume is very small, it is considered as ovulatory bleeding. In conclusion, vaginal bleeding is mostly associated with cervical tumors, dysfunctional uterine bleeding, cervical lesions, bleeding during pregnancy, etc. Therefore, regardless of the cause of vaginal bleeding, it is important to seek prompt medical attention to give symptomatic treatment. Do not delay to prevent severe bleeding that may lead to infection or secondary anemia.