For irregular menstruation, the first thing to know is how irregular menstruation is, whether it is a change in the cycle or a change in the period, whether it is too long or too short, irregular cycle and so on. As for the question of whether to do ultrasound or ultrasound of vagina for irregular menstruation, in fact, ultrasound includes ultrasound of vagina and ultrasound of abdomen. If you have sex, it is recommended to do vaginal ultrasound will be relatively clearer, irregular menstruation is not only for ultrasound, but also to do the relevant gynecological examination, sex hormone examination, as well as endocrine routine examination to understand the endocrine condition, hormone level changes, to further regulate menstruation. Generally, vaginal ultrasound can be done when you are sexually active. Understand the relevant situation, do auxiliary examination, so as to be able to further know the cause of irregular menstruation.