They can easily be remembered by using the mnemonic 'FISH SHAPED': F = Fainting. I = Imbalance of heat. S = Shock. H = Head Injury.

What does D stand for in fish shape?

Epilepsy - various types exist but they all involve some degree of electrical disturbance in the brain. Diabetes - caused by the bodies failure to regulate the amount of sugar in the blood stream. Two emergencies can occur hypoglycaemia or hyperglycaemia.

What causes unconsciousness?

Unconsciousness can be caused by nearly any major illness or injury. It can also be caused by substance (drug) and alcohol use. Choking on an object can result in unconsciousness as well. Brief unconsciousness (or fainting) is often a result from dehydration, low blood sugar, or temporary low blood pressure.