Irregular breast nodules may be breast tumor or breast hyperplasia, if it is tumor, there is a possibility of malignancy which needs further examination, but the specific probability cannot be generalized. 1. Breast hyperplasia: irregular breast nodules may also be breast hyperplasia, when the hyperplasia reaches a certain degree, it is easy to show irregular pattern. It is usually related to the menstrual cycle, more serious before menstruation, and the pain will disappear after menstruation. If the hyperplasia is more serious, it can be treated by surgery. 2. Breast tumor: the tumor with irregular shape is lobed breast tumor, which is benign in most cases, but there is also the possibility of malignant transformation, and the patient can determine the nature of the tumor through puncture biopsy. If the examination finds that the breast nodule is irregular in shape, the patient can go to the hospital and combine with other examinations to clarify the pathological nature of the breast nodule and take corresponding treatment measures.