Breast augmentation by injection is a way to augment the breasts by injecting different materials into the breasts. It is an invasive operation with certain risks, and the risks of different filling materials are as follows: 1. Autologous fat: it is the most commonly used injection material, which is less risky because it comes from itself, and its hazards mainly come from surgery. Most of the fat used in autologous fat injection breast augmentation comes from the abdomen, waist, buttocks, inner and outer thighs and other fatty parts, which are purified for breast injection. If the surgical process does not reach the sterile environment or aseptic operation is not standardized, it may cause infection and hard nodules, which may lead to abnormalities in the contour and shape of the breast, followed by obvious redness, swelling and pain, which requires corresponding treatment in a regular hospital; 2. More, the use of hyaluronic acid effect maintenance time is short, the doctor does not recommend injection; 3.Omidine: has been banned by the state, but there are still irregular places to take this material for profit, the risk is mainly bleeding, pain, septicemia, infection, hard nodes, etc.