This document provides information on breast self-examination (BSE). It recommends that women over 20 perform monthly BSE, a few days after their period if applicable. The method involves inspection of each breast while standing and lying down, using different hand positions to feel for lumps or abnormalities. Palpation techniques like circular, linear and wedge motions are used. Mammography is also discussed as a screening and diagnostic tool to detect breast cancer early through characteristic masses or microcalcifications.