In recent years, with the increasing knowledge of cancer prevention and fighting against cancer and the popularity of mammography and color ultrasound, breast nodules have become a common and confusing problem in people’s health checkups and outpatient visits. Breast nodules are mostly small lesions found by manual palpation or imaging (ultrasound, mammography, MRI). Nodules are not equivalent to tumors, but some nodules may be in the early or primary stages of tumors. Other nodules may be cystic dilatations of the breast ducts or even areas where the gland is interspersed with fat on imaging. For small nodules, imaging is also less definitive about their nature. However, it can provide more information, for example, the echogenicity, boundary, envelope, and blood flow on ultrasound examination, and the density and shape on mammography examination, all of which can be helpful in determining the nature of the nodule. The detection of breast nodules has both beneficial and detrimental aspects for the general population. We have a patient who was found to have a small nodule less than 1cm in size by ultrasound during a physical examination, and a biopsy was performed and the nodule was found to be invasive breast cancer. In this sense, the detection of nodules is beneficial to the early diagnosis and treatment of tumors. At the same time, there are other groups of people, especially the patients who come to the clinic in large numbers, may be due to breast pain, make an examination and unintentionally find small nodules, from then on, they worry about the cancer every day, which seriously affects their life and even becomes a psychological burden. Therefore, we should not think that small nodules with no symptoms are benign and not cancerous and do not need to be treated. Nor should we carry the ideological burden just because we find nodules. We should treat it with a scientific attitude, follow the advice of professional doctors, biopsy if needed, and follow up if needed. Treat it with a positive and optimistic attitude.