Shock: First aid. Shock may result from trauma, heatstroke, blood loss, an allergic reaction, severe infection, poisoning, severe burns or other causes. When a person is in shock, his or her organs aren't getting enough blood or oxygen. If untreated, this can lead to permanent organ damage or even death. Signs and symptoms of shock vary depending on circumstances and may include: Cool, clammy skin. Pale or ashen skin.