Having a gynecological ultrasound does not cause early menstruation. Early onset of menstruation is related to the female gonadal axis, that is, hypothalamus-pituitary-ovary, which is an endocrine system disorder. If menstruation is more than 7 days early, it is recommended to have a sex hormone 6 test on the 2nd to 5th day of the onset of menstruation. Gynecological ultrasound, whether abdominal or vaginal, does not affect the function of the female endocrine gonadal axis during the examination, which means that gynecological ultrasound does not affect the early onset of menstruation. In addition, early menstruation may also be related to gynecological inflammatory diseases and gynecological organic diseases, so when early menstruation occurs, it is recommended to consult the hospital and under the guidance of the doctor to carry out the relevant examinations and symptomatic treatment, do not act on your own, so as not to delay the condition.