In most cases, cystic breast nodules are benign and not serious, but in a few cases, they may be malignant and are more serious and require regular review to determine the next step of treatment. Usually, cystic breast nodules are caused by milk stagnation, endocrine disorders, etc. They are benign lesions, and are usually shown as a uniformly echogenic liquid dark area on ultrasound. The nodules can be eliminated through timely treatment and will not cause long-term effects, so they are not serious and do not cause too much anxiety. However, if the nodule grows rapidly in a short period of time and develops corresponding clinical symptoms or metastasis, pathologic biopsy is necessary to guard against malignant lesions. In conclusion, in most cases, cystic breast nodules are not serious, but in order to avoid malignant lesions affecting the treatment and prognosis, it is recommended that patients with breast nodules consult regular hospitals to clarify the benign or malignant nature of the nodules, and then follow the doctor’s instructions for further treatment and therapy.