Stumbling or falling. Slurring of speech. Difficulty of vision. Physical resistance to help. Collapse, stupor or unconsciousness.
Treatment Remove the patient from exposed environment.
Provide shelter and rest. Insulate against further heat loss by use of blankets or layers of warm clothing, huddling together in a survival bag, etc. Get medical help. Handle the casualty with minimum of rough movement. If at all possible, avoid going alone to the field.