To do gynecological examination, it is best to go back 3-7 days after menstruation, because at this time the endometrium is in the proliferative state, ultrasound examination can more clearly understand the situation of the endometrium. In addition, at this time, vaginal secretion, cervical secretion is relatively less, the doctor can more clearly see the cervix, to understand the vaginal mucosa, cervical mucosa whether there is congestion, edema, whether there is an abnormal organisms, will see very clearly. Gynecological examination also includes cervical cancer screening, to know whether the cervical epithelium has high-risk HPV infection, whether there are lesions, and need to do routine examination of leukorrhea, to know whether there are pathogenic bacteria infection. Ultrasound is also needed, which is divided into vaginal ultrasound and abdominal ultrasound, with vaginal ultrasound being clearer than abdominal ultrasound.