There is no inevitable connection between full breasts and breast cancer, because there is no relationship between the appearance of breast cancer and the size of breasts, and breast cancer can occur in both large and small breasts. If the patient’s breasts are fuller and the glands are more vigorous, the patient must observe the situation regularly and improve his living and dietary habits, eat less spicy, stimulating and greasy food intake regular breast self-examination and physical examination, and consult the doctor in time if there is any abnormality. Patients with fuller breasts should not wear tight underwear in daily life to avoid breast compression, and it is best to do breast ultrasound examination every six months, and usually should carry out breast self-examination, if there is any abnormality, and actively seek medical treatment, except for pathological conditions.