Breast color is also generally more accurate when done before menstruation, but it is still recommended that the ultrasound be done after the menstrual period. Doing color ultrasound before menstruation will not lead to inaccurate results in general, but it is generally not recommended to do breast color ultrasound before menstruation, and it is recommended to do the examination within 3~7 days after menstruation is cleaned up, because after menstruation period, the proliferation of breast tissue decreases, and it is easier to find the lesions, and after examination, it can understand the localized situation of the breasts better, and the results of the test are scientific. If the patient feels that the situation is more serious, it is possible to do the ultrasound before the onset of menstruation, but it is better to compare it with the ultrasound during the normal period in order to make a better judgment.