Urine ketone body (++) to analyze the causes of positive urine ketone body, positive urine ketone body mainly includes two aspects, one is starvation ketosis, the human body does not eat for a long time resulting in starvation, which can cause positive urine ketone body, at this time positive urine ketone body is not serious, after eating urine ketone body can disappear. The other is common in diabetic patients, if the blood sugar control is unstable or forget insulin injection, etc., the positive urine ketone body will appear under the triggering factors such as infection. At this time, it depends on the blood ketone bodies. If the blood ketone bodies are also significantly elevated, blood gas analysis needs to be checked to see if there is acidosis. If there is diabetic ketoacidosis belongs to the acute complication of diabetes, the condition should be more serious.