There are many reasons for small calcified foci in the breast, such as physiological phenomenon, breast hyperplasia, breast fibroadenoma, breast cancer and so on. 1. Physiological phenomenon: with the growing age, breast may appear aging, or due to the blockage of milk ducts, breastfeeding and other factors, resulting in the phenomenon of small calcified foci of the breast, which is a physiological phenomenon, and can be regularly reviewed. 2. Breast hyperplasia: Breast hyperplasia should be considered to be related to elevated prolactin and estrogen-progestin hormone imbalance, which may show small calcified foci in the breast, accompanied by breast pain and nodules. 3. Breast fibroadenoma: the etiology of breast fibroadenoma is not yet clear, it may be due to the breast tissue is more sensitive to estrogen, which may show the phenomenon of small calcified foci in the breast. 4. Breast cancer: Breast cancer imaging can show small calcified foci of the breast, accompanied by breast lumps, nipple discharge and other phenomena. There are many reasons for small calcified foci in the breast, if physiological phenomenon is excluded, it is recommended that patients go to the hospital in time to improve the examination and take standardized treatment according to the doctor’s instructions, and not to ignore the symptoms and take them lightly.