Try not to do breast ultrasound during menstruation. During different periods of the menstrual cycle, some physiological hyperplasia and rejuvenation of the breast will occur under the influence of various related endocrine hormones. The level of estrogen is higher before menstruation, the proliferation of glandular tissue in the breast will be more obvious, the breast tissue will be congested and edematous to varying degrees, the whole breast will be thicker, and some examinations will not be so suitable, which will affect the judgment of the nature of breast lumps, especially breast ultrasound examination. The most suitable time for breast ultrasound examination is the 5th-10th day after menstruation, because at this time estrogen has the least influence on breast tissue, breast tissue is in a relatively static state, and abnormalities and lesions of the breast are most easily detected. Therefore, you need to avoid the menstrual period for breast ultrasound examination.