There is a certain amount of blood circulating in the human body. If for some reason the amount of blood is reduced and lost, the amount of circulating blood is reduced, and at the same time the amount of blood transfused from the heart is reduced, the amount of blood that each tissue and organ can receive is also reduced, and at this time each cell, tissue, and function is damaged, and the pathological process is called hypovolemic shock. Hypovolemic shock is most commonly caused by traumatic hemorrhage, gastrointestinal bleeding, and other blood conditions. The most common manifestations of hypovolemic shock are blood loss, such as chest tightness, panic, dizziness, lack of energy, cold sweat, and little urination. Because of too much bleeding, increased respiratory rate and poor peripheral blood supply, the skin may be wet and cold, and in the most severe cases of too much blood loss, there may be signs of drowsiness and even fainting. If there is cold sweating or very obvious panic, heavy head and cold hands and extremities, pay attention to the fact that bleeding may already be occurring and hypovolemic shock may have occurred. This is the time to pay special attention and rush to contact the doctor for resuscitation.