Overview

By Mayo Clinic Staff

Shock is a condition brought on by a sudden drop in blood flow. As a result, the organs don't get enough oxygen. If shock isn't treated, it can lead to permanent organ damage or death. (1p1; 2p)

Shock may be caused by many conditions, including:

• Trauma or injury.
• Blood loss from an open wound or internal bleeding.
• Heatstroke.
• Not enough fluids, also called dehydration.
• Severe, widespread infection.
• Drug overdose.
• Severe burns.
• Allergic reactions.

Symptoms of shock vary. They may include:

• Cool, clammy skin.
• Pale or ashen skin.
• Blue or gray tinge to lips or fingernails.
• Rapid pulse.
• Rapid, shallow breathing.
• Upset stomach or vomiting.
• Enlarged pupils.
• Extreme weakness.
• Dizziness or fainting.
• Confused, anxious, restless or irritable.
• Unconscious.