Lack of oxygen to the vital organs due to any cause can result in shock. These can include severe decompression illness, haemorrhage, injury, infection, illness, burns, dehydration vomiting, diarrhoea, fright or emotional distress.

Signs & Symptoms of Shock:
• Pale, cold clammy skin
• Rapid, weak pulse
• Rapid, shallow breathing
• Weakness, collapse
• Thirst
• Nausea, vomiting
• Confusion, anxiety
• Unconsciousness, death

First Aid Treatment for Shock:
• Monitor the consciousness, airway and breathing
• Act to prevent further shock; Stop any severe bleeding
• Place the diver in a flat position with elevated legs
• Place an unconscious diver on the side to avoid aspiration of vomit and to maintain an open airway
• Provide supplementary oxygen
• Protect from the environment (rain, heat, wind)
• Seek medical advice
• Give nothing by mouth