For regular checkups, a second mammogram is recommended at one-year intervals; if there is a suspicion of breast disease, the time for the second checkup can be shortened to six months or even three months, depending on the doctor’s instructions. Mammography is a test that observes whether there are abnormalities in the breast tissue by transmitting low-dose X-rays through the breast. As mammograms are radioactive and can easily harm the body, it is usually recommended that the examination be performed at most once a year, i.e. one year between mammograms. If it is a regular physical examination, patients can have a mammogram once a year; however, if there are benign breast lesions, the examination can be repeated once every six months or so as instructed by the doctor, so as to monitor whether malignant changes have occurred in a timely manner. For patients with malignant breast tumors, the interval between checkups needs to be shortened accordingly, such as once every three months, depending on the progression of the disease. Mammography is commonly used to diagnose breast hyperplasia, mastitis, benign breast tumors, breast cancer and other diseases. Before the examination, you need to remove metal objects such as necklaces and rings, and keep the skin of the breast area clean, avoiding external plasters. The exact timing of the mammogram should be determined by the doctor according to the patient’s individual situation.