Diabetic ketoacidosis is one of the most common acute complications of diabetes, with a high mortality rate, diverse clinical manifestations, involving all systems of the body, and constantly changing as the disease occurs and develops. The main symptom in the early stage is the aggravation of the three symptoms of diabetes itself (drinking, urinating and eating more), the obvious of thirst and weakness, with the increase of urine, the body will gradually appear the symptoms of dehydration, the skin appears dry, if the condition is not timely controlled, continue to aggravate will appear nausea, vomiting, dizziness, drowsiness and other manifestations of brain hypoxia, some patients will also appear unexplained abdominal pain, dehydration If the condition continues to worsen, life-threatening manifestations will begin to appear if the condition is delayed, such as a drop in blood pressure or even can’t be measured, a fine pulse or even can’t be felt, deep breathing or even the smell of rotten apples, a gradual blurring of the state of consciousness or even a critical state of coma, and even the loss of time for rescue. Each stage of the development process of the above symptoms varies in length and is often combined with other complications or symptoms that trigger the disease, such as fever, cough and heart failure in case of infection, which can accelerate the progress of the disease.