Intravenous injection is a common way of medication in clinical practice, but intravenous injection also has its own hazards, as follows: 1. Intravenous injection may cause damage to blood vessels. 2. Intravenous injection of drugs may cause inflammation of the intima, which in turn may cause thrombotic superficial phlebitis. 3. Intravenous injection may infect other diseases directly through the punctured needles or drugs in case of incomplete sterilization. 4. and the most important One point, intravenous injection often accompanied by a large number of micron-sized plastic particles, such particles often run with the blood to all parts of the body, but can not be completely metabolized, and eventually appear in the body capillary endings such as brain, kidney and other functions of gradual damage.