Common causes are: 1. Climate factors: cold stimulation can promote increased secretion of adrenaline. Liver glycogen output increases, muscle uptake of glucose decreases, and the condition of elevated blood glucose is aggravated; hot and sweaty summer, pay attention to supplemental water, otherwise blood blood concentration and blood glucose increases. 2. cold: cold can make blood glucose increase. The patients with trauma, surgery, fever, severe trauma, vomiting, insomnia, anger, exertion, acute myocardial infarction and other stressful situations can make the blood sugar rise rapidly and even induce diabetic ketoacidosis. 3. Insufficient drug dose: Some patients reduce the drug dose by themselves; some do not check the blood sugar for a long time, so that the original dose is not adjusted in time after the blood sugar rises. Inadequate dose of drugs can cause blood glucose to rise and even ketoacidosis to occur.