Ketoacidosis is very dangerous, and if left untreated, it can cause death due to disturbance of acid-base balance in the body and electrolyte imbalance. Serious complications usually include the following: 1. Patients may develop cerebral edema and acute cerebral edema and cerebrovascular disease if rehydration is inappropriate or blood glucose drops too fast. 2. Elderly people or those with combined coronary heart disease may develop heart failure and acute pulmonary edema if rehydration is excessive. 3. 5. Patients may also have disorders of lipid metabolism.