Hypovolemic shock is a life-threatening condition that happens when you lose a lot of blood or fluids. Learn about the causes, symptoms, stages, diagnosis, and treatment of this emergency, and how to prevent complications. Hypovolemic shock is a life-threatening condition caused by losing more than 15 percent of blood or fluids, preventing the heart from pumping enough blood. Hypovolemic shock is an extreme drop in blood volume that is a medical emergency. Learn more about its symptoms, causes, and treatment. Hypovolemic Shock - Symptoms, Reasons and Treatment Hypovolemic shock occurs when the body loses a significant amount of blood or fluid, leading to inadequate circulation and oxygen delivery to tissues.