If the answer to the question why one breast is bigger than the other is not a physiological change in the body, then this may be the development of a tumor process, which is quite rare.
Uma impendulo yombuzo kungani eyodwa webele kunangendlela omunye akuzona izinguquko bokuphila emzimbeni, kungenzeka ukuthuthukiswa isimila, okuyinto ngempela ezingavamile.