Diabetes mellitus
Too low blood glucose is called hypoglycemia. It can also cause acute complications. If too low, diabetics can have many symptoms such as sweating, trembling, anger (or feeling passive), and possibly even passing out. Diabetics with hypoglycemia may be confused or even unconscious. They may appear to have drunk too much alcohol. Severe hypoglycemia is very dangerous and can cause death. The best treatment of hypoglycemia is avoiding it. If it happens, eating food containing glucose (for example, table sugar) usually improves the condition quickly. Sometimes it is treated by giving an injection of a medicine called 'glucagon'. Glucagon is a hormone made by the pancreas. It has the opposite effect of insulin. Administering glucagon will cause the blood glucose level to rise by forcing stored glucose into the blood.  Hypoglycemia is usually caused by too much diabetic medication, insufficient food, too much exercise, or a combination of these.