Monthly breast self-examinations are recommended for women over the age of 18: Step 1: Observation A pre-mirror examination. First, you stand in front of the mirror with your upper body naked and your arms hanging at your sides and observe the appearance of your breasts. It is important to be familiar with the appearance of your normal breasts so that you can detect any abnormalities. However, it is not abnormal for one breast to be slightly larger than the other. Next, raise your arms above your head and rotate your body to see if there are any changes in the shape of your breasts. Then, slowly rotate your body with your arms crossed to the right and left to see if there is any dimpling, redness or skin damage to the nipples and breasts. Finally, place your palms on your hips and press down hard while rotating your body so that the contours of your breasts appear clear. Pay attention to any abnormal changes in the shape of the breast, and if you find any abnormal changes, you need to compare it with the other side to check whether the bilateral breasts are symmetrical. If there is asymmetry, be alert and seek medical attention. Step 2: Touch Check in a standing or sitting position. First, raise your left hand behind your head and then use your right hand to examine the left breast. The correct range for breast examination: up to the subclavian, down to the sixth rib, lateral to the anterior axillary line, and medially near the sternum. The correct technique of examination: three fingers together, from the 12 o’clock above the breast (the breast is compared to a clock), using the fingertips in the direction of the clock to massage the skin for the cycle of examination, each check after a circle back to 12 o’clock, move down 2 cm to do a second circle. The third circle of inspection, to check the entire breast up to the nipple. Check the fingers can not be detached from the skin, the force should be even, to master the strength of the fingers can touch the rib cage as appropriate. This method is known as the acupressure cycle massage method. After examining the left breast, raise your right hand behind your head and examine the right breast with your left hand in the same way as above. Reclining position examination. The body is lying flat on the bed with a small pillow or folded towel under the shoulder so that the whole breast is flat against the chest wall to facilitate the examination of any abnormal lumps in the breast. Since the breast sags in the sitting or standing position, especially in fat women, it is easy to miss the lumps located in the lower part of the breast, so it is also necessary to check in the lying position. The scope and technique of the examination is the same as that of the sitting or standing examination. Step 3: Pressure After you have examined the entire breast, gently lift the nipple with the index finger, middle finger and thumb and squeeze it to check carefully for discharge. If you find any discharge, you should go to the hospital for further examination. Finally, check for enlarged nodules in the upper, lower, anterior, posterior and median areas of the armpit.