Breast nodule category 3 does not usually present with symptoms of chest tightness. Breast nodule category 3 means that breast nodules are benign lesions, the cause of which is not yet clear, and may be related to breast infection or injury, or endocrine hormone level disorders, gene mutation, environmental factors. They usually do not have symptoms of chest tightness, and are often unilateral or bilateral multiple nodules, some of which are accompanied by periodic swelling and pain, with clear contours and no adhesion to the skin. Once diagnosed with breast nodule category 3, consider regular follow-up observation, monthly breast self-examination, raising awareness of cancer prevention, and seeking timely medical attention for abnormal breast changes. Diet should be balanced, eat more fresh vegetables and fruits. Maintain a healthy lifestyle and participate in outdoor activities to improve immunity. Regular breast cancer screening should be conducted so that breast cancer can be detected in time. Breast nodule category 3 usually does not have chest tightness, if chest tightness symptoms, it is recommended to go to the hospital in time, to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.