Causes of Unconsciousness

Many conditions may render a person unconscious. FISH SHAPED is a simple way to remember the common cause.

Fainting is a temporary lack of oxygenated blood flowing to the brain; there are many reasons why a person might faint, such as standing up too fast, an underlying health condition, lack of food, or a virus. Additional injuries may occur due to the casualty falling, so be aware of what medication they may be taking as blood thinning medication.

Treatment for Fainting

Prioritise the airway; if vomit or blood is present, tilt the casualty head to the side to allow fluids to flow away; place them in the recovery position if it is difficult to maintain the airways. If the casualty is alert, raise the legs to allow blood to flow into the core body. Be aware of injuries before lifting legs. consider Top-To-Toe.

The mechanism of injury can give the first aider an evaluation of what has occurred and the possibility of injuries that may be inflicted. Consider a head-on collision of two cars travelling at 70MPH. Consider multiple casualties, injuries or fatalities.

Consider the elderly; a fall on grass could cause their fragile bones to break, with the neck or femur fracture being the most common. This fracture can be life-threatening for an old person.

Heat Stroke 40-43 degrees Celsius


Heat Exhaustion 37-39 degrees Celsius


Normal body temperature


Mild Hypothermia 31-34 degrees Celsius


Unconscious, fitting, confused, headaches, strong pounding pulse, flush hot skin.


Cramps in legs, arms and stomach, pale sweaty skin, loss of appetite and nausea.


Normal Temperature 36-37 degrees Celsius


Shivering, Fatigued, Slurred speech, confused, slow weak pulse, Pale cold skin. blue lips and fingertips.


Hypothermia is a dangerous drop in body temperature below 35C (normal body temperature is around 37C). It’s a medical emergency that needs to be treated in a hospital.

  • shivering
  • pale, cold and dry skin – skin and lips may turn blue or grey (on black or brown skin, this may be easier to see on the palms of the hands or the soles of the feet)
  • slurred speech
  • slow breathing
  • tiredness or confusion
  • cold to touch
  • floppy
  • unusually quiet and sleepy and may refuse to feed

The casualty’s airway must be checked, and ensure they are breathing; if not start CPR.

  • Call 999 if you suspect hypothermia.
  • Gently relocate the victim to warm shelter.
  • Remove all wet clothing.
  • Apply heat to the body’s center, from the neck to the pelvis. Avoid using heating pads, hot water bottles, or any localized heat. Use an electric blanket when possible.
  • If the affected person is alert and able to swallow, provide a warm, sweet, nonalcoholic, noncaffeinated beverage to help warm the body.
  • Use warm, dry compresses.
  • Remove the person from the cold environment and provide shelter from the rain, wet, and wind.
  • Warm the person by wrapping them in a blanket, such as a ‘space blanket’.
  • If the person is fully conscious, give them warm, sweet drinks.