During the menstrual cycle, due to the influence of various related endocrine hormones, the breast will undergo some physiological changes of hyperplasia and rejuvenation, causing the breast tissue to be in various degrees of congestion and edema, and these changes may interfere with the doctor’s examination of the location, size and nature of the breast lump, thus affecting the judgment of the nature of the breast lump. So what is the best time to check for breast disease? The best time to visit the breast: It should be done first 3 to 5 days after menstruation or 9 to 11 days from the start of menstruation. A. Because the breast tissue is affected by ovarian hormones before menstruation, the breast tissue is enlarged and thickened, and is in a state of congestion, accompanied by pressure pain and swelling, so the examination is not easy to be accurate at this time, and it is easy to misdiagnose or miss the diagnosis. B. 9 to 11 days after the start of menstruation or 3 to 5 days after cleansing is the period when the breast is least affected by hormones and the glandular tissue is the thinnest and softest, so lesions or abnormalities of the breast are easily detected and can be easily touched, which is the best time for examination. C. Older women after menopause are also less affected by endocrine hormones due to the decrease of estrogen in their bodies, thus they can choose the time of consultation at will. However, you should be reminded that the high incidence of breast cancer is between the ages of 35-40 and 45-50. If breast lesions are detected during self-examination or screening, you should consult a doctor as early as possible and follow the doctor’s instructions for follow-up. Some patients do not have regular follow-up examinations for a long time after the clinical remission of benign breast disease, and it will be very difficult to cure them when the original benign lesions have become malignant. Therefore, early consultation should be an important principle, and choosing the best time for consultation is an important means to improve the correct diagnosis.