The common causes for inducing a coma include cerebral apoplexy (cerebral hemorrhage and cerebral infarction are included); hypoglycemic coma caused by diabetes, ketoacidosis caused by hyperglycemia; acute poisoning, for example, carbon monoxide poisoning, drug poisoning and alcoholism; heatstroke and electric shock and other physical injuries; severe cerebral trauma.

   Acute stroke. Patients over middle age, with hypertension and the medical history of arteriosclerosis will have symptoms including significant rise in blood pressure, projectile vomiting, severe headache and numbness of limbs before coma when they fall into a coma suddenly.

   Hypoglycemic coma. People who have a medical history of diabetes, long-term oral administration of hypoglycemic drugs, abnormal diet during recent days, without reducing the amount of hypoglycemic drugs and eat too little or don’t eat anything will fall into a coma suddenly due to the occurrence of hypoglycemia.

   Carbon monoxide poisoning. People who live in the environment with furnace or warm themselves by man-made central heating equipment, or make use of a gas water heater for a long time might have carbon monoxide poisoning. And severe poisoning will cause coma.