Here's what you should know.
Fainting and Loss of Consciousness
If the victim is bleeding or injured, begin appropriate first aid. People with diabetes can sometimes lose consciousness if their blood sugar levels are too high or too low. In some instances, you may receive a head CT scan. During a heart attack, blood supply that normally nourishes the heart with oxygen is cut off and the heart muscle begins to die. If you suspect that the cause is excessive heat, move the person to a cooler place. When to call When someone has fainted, call emergency services if the person: Lay the person on her back, elevating the legs eight to 12 inches.