There are two main reasons why mammograms are not recommended for young people, one is the structure of the breast and the other is the danger of X-rays. 1. Breast structure: Young women have dense breast glands, which may cover up the lumps, making them difficult to visualize and affecting the test results. 2. X-ray hazards: Mammograms are performed using X-rays, which are radioactive. Frequent molybdenum target examination leads to malformation of germ cells, which may affect the normal fertility of young people, and may also lead to cell mutation, inducing malignant tumors and other diseases, endangering the physical health of young people. Young people are recommended to have breast color ultrasound examination, and after the age of 40, they can have regular molybdenum target examination. However, if your condition requires a mammogram, it is recommended that you follow your clinician’s advice. A single checkup will not affect your health too much.