Which is more serious, fulminant type 1 diabetes or type 1 diabetes, needs to be determined by your doctor in the context of your specific condition, and in general, fulminant type 1 diabetes is more serious. Diabetes mellitus type 1 is a rare subtype of type 1 diabetes mellitus. The disease starts rapidly and progresses rapidly, with a significant rise in blood glucose in a short period of time, and ketoacidosis may occur rapidly, which may be combined with serious complications such as rhabdomyolysis and acute renal failure, and if not diagnosed and treated in a timely manner, the prognosis is dire. Once diagnosed, treatment such as rehydration and intravenous insulin should be given, and lifelong insulin therapy is required when diabetic ketoacidosis is corrected. Regardless of the type of diabetes mellitus, it is recommended to go to the hospital as soon as possible, through the appropriate examination, according to the specific circumstances, follow the doctor’s advice, and actively cooperate with the treatment.