Whether breast ultrasound can be done when you are menstruating is indeed a great concern for many women. Because estrogen has begun to decline during menstruation, breast tissue is usually not congested and edematous at this time, and breasts do not appear to be swollen and painful, so breast ultrasound can be performed during menstruation. The female cycle is divided into four main periods, namely the follicular phase, ovulation, luteal phase and menstrual phase. It is also important to note that women need to avoid getting cold during their menstrual period. When receiving ultrasound examinations, they can inform the doctor that they are in their menstrual period, and as long as conditions allow, the doctor will try to use a heated coupling agent to avoid cold irritation to the skin. Patients can also cover their lower abdomen with clothes to avoid getting cold while undergoing the examination.