“Mastocytosis” may seem familiar to everyone, but how many people know what “mastocytosis” is? Clinicians diagnose “severe breast enlargement” when they feel the breast with their hands, patients are often told “you have breast enlargement” after an ultrasound, and the report column of mammograms often says “breast enlargement” prominently. “We have asked many “patients” who think they have been suffering from “breast enlargement” for years, what is “breast enlargement”? The answers were varied: “I don’t know”, “it’s just a lump”, “breast pain” and so on. Not only patients, but many non-breast specialists are also unable to explain what “breast enlargement” is. What exactly is “mastopexy”? What happens when you have “breast enlargement”? The term “mammary hyperplasia” usually refers to the non-inflammatory, non-tumorigenic changes in the benign breast structure of the breast. Symptom-wise, breast hyperplasia can be characterized by breast cysts, breast pain, nipple overflow, etc., but it is not as simple as “breast cysts” or “breast pain”. In the past, it was often said that “cancer is a scary thing”, but nowadays many women have become “scared of hyperplasia too”. In fact, it is not necessary. The term “breast enlargement” itself is a pathological term. It is the name of a pathological diagnosis made by observing cell changes under a microscope. Therefore, it is not scientific for a doctor to say “breast enlargement” just by touching the breast, or for an ultrasonographer to diagnose “severe breast enlargement” just by looking at the image, or for a radiologist to take a film and come up with “breast enlargement”. “It is not scientific. There are many other names for “mastocytosis”: cystic hyperplasia, fibrocystic breast disease, sclerosing adenopathy, and so on. The name “benign breast dysplasia” recommended by the World Health Organization may be easier for patients to understand and less likely to cause unnecessary alarm. It is recommended that ultrasound and mammography reports should not be used to blindly diagnose mastocytosis, but rather to promote the use of the breast imaging classification system (category 1 no lesions, category 2 benign lesions, category 3 possible benign lesions, category 4 possible malignant lesions, category 5 consistent with malignant lesions). Therefore, it is not necessary to panic when you hear that you have “mastocytosis”, but only the conclusion of “mastocytosis” after surgical biopsy is reliable. Moreover, only those with “atypical hyperplasia” have an increased risk of breast cancer (1.5 to 5 times), so such patients need to insist on having a mammogram at least once a year at a regular hospital’s breast department.