Type 1 diabetes that develops violently at age 50 may not have much impact on life expectancy if treated promptly; however, it may shorten survival if it is poorly controlled and causes a range of complications. There is no data to support exactly how long to live. After the detection of fulminant type 1 diabetes mellitus at the age of 50, if it can be treated in a timely manner to control the blood glucose to the optimal range and there are no related complications, it will not generally threaten the patient’s life expectancy, and will be no different from the survival time of a normal person. However, some patients with poor control after detection of fulminant type 1 diabetes mellitus, a short period of significant increase in blood glucose while glycated hemoglobin is normal or mildly elevated, the rapid emergence of ketoacidosis, which can be combined with rhabdomyolysis, acute renal failure and other serious complications, such as timely diagnosis and treatment, if not, the prognosis of the menacing. Diabetes mellitus type 1 does not directly lead to death, so now after the detection of the disease should be strictly in accordance with the doctor to carry out professional treatment, to prevent the disease from continuing to aggravate caused by other complications.