Generally smaller breast nodules cannot be felt; if the nodule is more than one centimeter in diameter, it is usually palpable and feels like a hard lump inside the breast. Breast nodules can be categorized into benign breast nodules and malignant breast nodules. Generally, benign breast nodules have clear contours and good mobility; malignant breast nodules have unclear borders. 1. Benign breast nodules: usually benign breast nodules have clear outlines, good mobility, no adhesion to the skin and slow growth rate. Patients may have symptoms such as cyclic breast swelling and pain, tenderness, etc. Hyperplastic nodules usually have increased discomfort before menstruation, and gradually decrease or disappear after menstruation. 2. Malignant breast nodule: Usually malignant breast nodule has unclear boundary, hard texture, poor mobility, and the nodule usually adheres to the skin and grows faster. Patients usually have no obvious pain in the breast, and some of them may have symptoms such as nipple discharge and nipple inversion. Breast nodules vary in nature and texture. If you are diagnosed with breast nodules, it is recommended to go to the hospital for regular treatment.