Why are there breasts?

There are mainly the following reasons for the formation of accessory breasts, including abnormal embryonic development, genetic factors, changes in hormone levels, etc. 1. Abnormal embryonic development In the process of embryonic development, the mammary gland primordium fails to completely degenerate, which may lead to the appearance of accessory breasts. Under normal circumstances, there are 6 to 8 pairs of mammary gland primordium on two lines from armpit to groin. 2. Genetic factors may play a role in the occurrence of secondary lactation. If there is a history of secondary lactation in the family, the risk of secondary lactation may be relatively increased. 3. Changes in hormone levels Fluctuations in hormone levels in the body, especially changes in estrogen and progesterone, may stimulate hyperplasia of breast tissue, including accessory breast tissue. For example, during puberty, pregnancy, lactation and other special periods, accessory breast may become more obvious or symptomatic due to hormone effects. Understanding the causes of breast formation helps us to better understand and treat this phenomenon. For breast, if there are no obvious symptoms or do not affect the appearance, usually do not need special treatment, but need to closely observe. If there is pain, swelling, rapid enlargement or other abnormal manifestations, or psychological burden caused by great influence on aesthetics, seek medical attention in time, and the doctor will choose the appropriate treatment method according to the specific situation.