Ultrasound can also be done during menstruation. If you have abdominal pain or discomfort during menstruation, you can also have an ultrasound examination to understand the condition of the uterine adnexa, pelvis and endometrium. However, if there are no uncomfortable symptoms, it is better to have an ultrasound examination after the menstruation is over. This is because the accumulation of blood in the uterine cavity during menstruation may have some influence on the judgment of the endometrium, and the pelvic congestion of women during menstruation may also enlarge the uterus. Therefore, ultrasound during menstruation is relatively inaccurate, but ultrasound can also be performed during menstruation if there is an acute abdomen.