Traumatic stress reaction is when the body suffers from external force and trauma, the body has to react to the stress, when the body reacts, some changes will occur, such as pain and blood loss after trauma, this situation also has some tension and fear, which can cause a series of reactions in the body. For example, blood loss may cause vasoconstriction throughout the body to maintain the blood supply to vital organs, which may result in some conditions, such as poor peripheral circulation and pallor, and reduced peripheral circulation after blood loss. Ischemia of some major organs will show corresponding symptoms, for example, heart and brain tissues may be the most sensitive and the most responsive to us. After the occurrence of trauma, the body will have many stress reactions, which is a mechanism of self-protection of the body. After this occurs, it provides some basis for our clinical diagnosis and treatment, and suggests where we should start our next treatment, and also can determine the degree of damage caused by trauma.