How often should I go to the oncologist-mammologist? First of all, you need to choose the "right" day of the cycle for a visit to the doctor – from 5 to 10 days, counting from the first day of menstruation. If the doctor conducted the necessary examination during the consultation and in conclusion said that you do not have pathologies, then the preventive examination should be carried out once a year. Nevertheless, every month in the same period it is important to carry out self-examination of the breast for the presence of seals. If at the doctor's office were identified any problems, it is necessary to follow all the recommendations you need to contact the mammologist with the frequency with which he recommends you: after 3 months, six months and more.