Self-examination of breast is usually done every month (3 to 5 days after the onset of menses in premenopausal and on a fixed day in a month in postmenopausal women. You can learn more from the following websites. https://medlineplus.gov/ency/article/001993.htm, https://www.mayoclinic.org/tests-procedures/breast-exam/about/pac-20393237
How and how often should I check my breasts?
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