WebMD reports that insulin shock, which is also known as diabetic shock, results from being extremely hypoglycemic. It occurs when the body has too much insulin. Insulin shock has a tendency to occur when there is unbalanced insulin in a person's system, which sometimes results from combined changes in an individual's physical activity and diet.
Dealing with Diabetes explains that insulin shock occurs in either type 1 or type 2 diabetics who have blood sugar levels that are too low. Low blood sugar in this case means that it is below 70 milligrams per deciliter. The most common cause of insulin shock is skipping meals, but others experience this condition after taking too much diabetes medication or exercising too strenuously.
The Mayo Clinic adds that another cause of hypoglycemia is drinking too much alcohol. People who have had diabetes for a long time do not always notice the early warning signs of this condition, which include perspiration and hunger. Not fixing this problem in time has the ability to cause someone to go into a diabetic coma.
WebMD lists one of the early symptoms of hypoglycemia as fainting, which requires immediate medical attention. If left untreated, it is possible for an individual to experience a diabetic coma or even death.