Types of breast nodules are generally identified by the rate of growth of the nodule, its texture, blood supply, and the effect of hormone levels. Breast nodules are generally categorized as benign and malignant. 1. Growth rate: benign breast nodules usually grow slowly or do not grow, while malignant nodules grow faster or even grow explosively and eventually become cancerous. 2. Texture: benign nodules such as breast fibroma are hard to the touch, like the tip of the nose, with good mobility, while malignant nodules such as breast cancer are hard to the touch, similar to the forehead, with bad mobility. 3. Blood flow supply: Generally breast nodules need to be examined by color ultrasound, in which it can be observed that benign nodules have little or almost no blood flow supply, while malignant nodules have rich or more blood flow supply. 4. Hormone level: with the change of hormone level, the nodules will also change. When the estrogen level returns to normal, benign nodules will generally degenerate with time and dissipate on their own, while malignant nodules will keep growing and become bigger and bigger. The nature of breast nodules should be comprehensively identified from the above aspects, and it is recommended to go to a regular hospital for examination, assessment and guidance by a specialist.