When is it too early to get checked for breast cancer prevention? Some doctors suggest 40 years old, some say 30 years old – in fact, it should be 20 years old. From the age of 20, women should pay attention to and take care of their breasts, self-examine their breasts once a month and go to the hospital for breast examination once every three years; from 40 to 50 years old, every one or two years; for women over 50 years old, they should have a breast health examination once a year; for those who have benign breast diseases, they should have an examination once every six months. Oncology experts believe that it is impossible for cells in human body to change from normal state to cancer cells at once, there is a gradual process from quantitative to qualitative change between them, and this process may take 5 to 10 years. If you can detect cancer cells in its budding state, maybe only a minor surgery is needed; you can still continue your old life because the cure rate of early stage breast cancer is over 90%. On the other hand, most of the patients with intermediate and advanced breast cancer not only lose their beautiful breasts, but also their incomparably precious lives. Medical experts and media used to emphasize that women should perform self-examination of their breasts, but the U.S. guidelines for early cancer diagnosis in 2005 no longer recommend regular breast self-examination as an early diagnosis of breast cancer. This is not to deny the importance of breast self-examination, but the key problem is that most patients do not master the “self-examination technique”, resulting in many tumors not being detected at all.