Type 1 diabetes and type 2 diabetes are two types of diabetes, and it is not possible to simply say which is less severe and which is more severe. The severity of the disease is related to the progression of the disease. Type 1 diabetes is caused by an absolute lack of insulin. Type 2 diabetes is caused by a relative lack of insulin or insulin resistance. 1. Type 1 diabetes mellitus: the age of onset is relatively young; the onset of the disease is more acute and the condition changes more quickly; the treatment must rely on insulin, through the injection of insulin to achieve the purpose of lowering blood glucose; it is more likely to develop ketoacidosis. 2. Type 2 diabetes mellitus: the onset of the disease is later, mostly after the age of 40; the change of the disease is relatively insidious; the treatment can use hypoglycemic drugs and insulin. Comparatively speaking, the quality of life of patients with type 1 diabetes mellitus is poor, but type 2 diabetes mellitus will also have poor quality of life and serious consequences if blood glucose control is not satisfactory. type 1 diabetes mellitus is prone to diabetic nephropathy, while type 2 diabetes mellitus involves multiple organs. Whether it is type 1 diabetes or type 2 diabetes, you should follow the doctor’s instructions to standardize the treatment, do not arbitrarily add or subtract drugs, so as not to worsen the condition, resulting in adverse consequences.