Breast Self-Examination - A Guide to Proper Self-Checks and the Importance of Screening

The Current State of Breast Cancer - Why Self-Checks Matter

Breast cancer is the most common cancer among Japanese women, affecting approximately 1 in 9 women in their lifetime. Annual new cases exceed 90,000 and continue to rise. However, the 5-year survival rate when detected early (Stage 0-I) is over 95%, making early detection a critical factor in survival. About 60% of breast cancers are discovered because the patient herself noticed a "lump." In other words, the ability to notice changes in your own body is the first line of defense in saving your life. Regular self-checks are an important means of catching changes that occur between screenings.

Proper Self-Examination Procedure

Visual Inspection - Checking in Front of a Mirror

Undress from the waist up and observe your breasts in the mirror in three positions: arms down, arms raised, and hands on hips with chest muscles tensed. Check for changes in shape or size between left and right breasts, skin dimpling or puckering, changes in nipple direction, and orange-peel texture (peau d'orange) on the skin.

Palpation - Feeling with Your Fingertips

Lie on your back and raise the arm on the side being examined above your head. Using the pads of three fingers (index, middle, and ring) of the opposite hand, feel the entire breast in small circular motions. Move clockwise from the outer upper area in a spiral pattern toward the center. Apply three levels of pressure - light, medium, and firm - to check from superficial to deep tissue. Don't forget to palpate the axillary (armpit) lymph nodes. Finally, gently squeeze the nipple to check for discharge.

Characteristics of Concerning Lumps

Most breast lumps are benign. Fibrocystic changes, fibroadenomas, and cysts account for the majority of non-cancerous lumps. However, seek medical attention promptly if you notice: a hard lump that doesn't move easily, a lump that persists regardless of menstrual cycle, a lump that gradually grows, a painless lump (early breast cancer often presents without pain), or a lump in only one breast. Benign lumps tend to be elastic and move when pressed. However, self-diagnosis is dangerous - if you notice any concerning lump, seeing a specialist is best. For managing everyday anxiety, see our article on daily anxiety management techniques.

Nipple Discharge Checkpoints

Nipple discharge can occur outside of breastfeeding. Clear or milky discharge is usually benign, but bloody discharge requires medical evaluation as it may indicate intraductal papilloma or breast cancer. Discharge from only one nipple or spontaneous discharge (without compression) also warrants attention. Recording the color, amount, and frequency of discharge helps provide accurate information to your doctor.

Differences Between Mammography and Ultrasound

Mammography compresses the breast for X-ray imaging and excels at detecting microcalcifications (which can be early signs of cancer). It is the standard screening method recommended for women over 40. However, in younger women with dense breast tissue, it can be difficult to distinguish between breast tissue and lumps, reducing detection sensitivity. Ultrasound has no radiation exposure and can detect lumps even in women with dense breasts. It is used for women under 30 or in combination when mammography results are inconclusive. Rather than choosing one or the other, using both appropriately based on age and breast density is important. For general lifestyle disease prevention, see our article on the basics of preventing lifestyle diseases.

Recommended Screening Schedule by Age

Women in their 20s-30s should establish monthly self-checks as a habit and get ultrasound examinations if symptoms arise. While not covered by municipal screening programs at this age, women with family history are recommended to begin regular screening from their 30s. From age 40, biennial mammography screening is nationally recommended. Take advantage of free municipal screening coupons. The same biennial screening continues from age 50 onward. Breast cancer incidence peaks between ages 40-60, but it also occurs after 70, so don't stop screening because of age. Women with family history of breast cancer (mother, sister, daughter) have 2-3 times higher risk and are recommended to begin screening earlier and more frequently. Related books on breast cancer screening can be found on Amazon.

Optimal Timing for Self-Checks

For menstruating women, within one week after the end of menstruation is the optimal time for self-checks. Before menstruation, breast tissue becomes swollen and firm, making it difficult to distinguish from lumps. Post-menopausal women should choose the same day each month (for example, the 1st of every month) for regular checks. Performing palpation during bathing with soapy hands makes it easier to detect small lumps. Self-checks take only about 5 minutes. By performing them at the same time each month, you become familiar with your breasts' "normal state" and can more easily notice subtle changes. For concerns about age-related appearance changes, see our article on facing the fear of visible aging. Books on women's health can also be found on Amazon.

Lowering the Barrier to Screening

Breast cancer screening rates in Japan remain at about 47%, low compared to 70-80% in Western countries. Top reasons for not getting screened include "no time," "it seems painful," and "I'm afraid of finding something." Mammography pain varies individually but is reduced when performed during the post-menstrual period when breasts are softer. The examination takes about 10-15 minutes, with results arriving in 1-2 weeks. If pain is a concern, consulting the facility in advance may allow compression adjustment. The fear of "finding something" is natural, but early detection expands treatment options and reduces physical burden. Reframe screening not as "something scary" but as "something that provides peace of mind" - that's the first step toward getting screened.