Doing breast ultrasound for menstruation may have an effect, avoid breast ultrasound for menstruation when possible, but go to the hospital for examination in time if your breasts are seriously uncomfortable. When the estrogen level is higher during menstruation, the glandular tissue of the breast may proliferate and thicken, with varying degrees of edema and congestion, and the structure of the breast is more ambiguous, which in turn affects the judgment of the nature of the breast lump. However, if there is a clear lump, swelling or lesion in the breast, the breast ultrasound can still be detected during menstruation. It is recommended to avoid the menstrual period as much as possible. 7-10 days after the end of menstruation is the ideal time for breast ultrasound, when the breast tissue is in a static state, and abnormalities or lesions in the breast are more easily detected. If you notice any serious discomfort in your breasts and need to have a breast ultrasound, go to the hospital in time and don’t delay going for the examination because of your menstrual period.