Breast nodules usually do not become breast cysts, there is no such thing as good or bad, breast nodules and breast cysts are two kinds of diseases. 1. Breast nodule: Breast nodule is a broader concept, touching or checking found to present a nodular state, so it is called breast nodule. They may be related to endocrine hormones and environmental factors, and are commonly found in breast hyperplasia, breast fibroadenoma, breast cancer and other diseases. There are benign and malignant breast nodules, benign nodules can be observed and treated conservatively; malignant nodules, such as breast cancer, usually require surgical treatment. 2. Breast cyst: It is a round or oval, fluid-filled cystic mass inside the breast. They are usually characterized by symptoms such as breast lumps, breast discharge, and inflammation. Most of the breast cysts do not require surgical treatment, and clinical follow-up observation is the main focus, but some cysts are malignant and require timely surgical treatment. Breast nodules and breast cysts are two kinds of diseases, and it is recommended that patients should consult regular hospitals in time to get a clear diagnosis and follow the doctor’s instructions for treatment.