Breast self-examination (BSE) involves women looking for lumps or changes in their breasts by sight and touch to detect breast cancer early. BSE should be performed monthly, particularly after menstruation. Regular BSE allows women to familiarize themselves with their breasts and identify any new changes, improving early detection. While lack of confidence can deter BSE, recommendations include all women over 20 performing monthly BSE and regular clinical exams/mammograms depending on age to screen for breast cancer. Proper technique involves visual inspection in front of a mirror with various arm positions followed by systematic circular palpation of each breast in different positions.