Ultrasound can be divided by the route of examination into pelvic ultrasound, which requires holding urine and is generally recommended for women who are not sexually active, and cathodic ultrasound, which does not require holding urine and the probe enters the vagina for examination and is recommended for women who are sexually active. Both are used to find out if the uterus, both adnexa and the basic structures in the pelvis are normal. The negative ultrasound can be seen more clearly, while the abdominal ultrasound may be affected by the degree of bladder filling, the thickness of the fatty layer of the abdominal wall, etc. Women should have an ultrasound once a year, relying solely on gynecological checkups sometimes cannot more accurately determine minor lesions, such as uterine fibroids, ovarian cysts, ectopic pregnancy, early pregnancy, endometrial polyps, pelvic effusion and monitoring ovulation, etc. It is an indispensable gynecological examination, which is almost harmless to the body and may be normal to feel a little discomfort during the operation. For women who are not sexually active, it is important to inform the clinician because the examination process requires the probe to be inserted into the vagina; it is also not recommended if there is a lot of vaginal bleeding, which may cause infection. The best time to come for the examination is usually about three days after the menstrual period. There are many advantages of negative ultrasound. Women who are found to have lesions such as myomas and cysts should review the ultrasound regularly to understand the progress of the disease.