Breast nodules 3cm cannot be accurately determined as to what grade the nodule belongs to and cannot be graded directly based on the size of the nodule. Breast nodules may be benign or malignant. Benign nodules are not graded clinically. For smaller benign nodules, no special treatment can be done first and regular observation is enough, while larger benign nodules can be cured after timely surgery. The 3cm malignant breast nodule cannot be graded purely on the basis of size, but also on the basis of whether there is regional lymph node metastasis or distant metastasis. If 3cm breast nodules are found, it is recommended to consult a doctor in time and understand the nature of the nodules through pathological examination, and then according to the diagnostic results of targeted treatment, so as not to delay the condition.