The difference between type 1 diabetes and type 2 diabetes, i.e., type 1 diabetes and type 2 diabetes, lies in the different causes of the disease, age, symptoms, and treatment modalities. 1. Causes: Type 1 diabetes is mainly caused by insufficient insulin secretion, while type 2 diabetes is mainly caused by insulin tolerance. 2. Age: Type 1 diabetes occurs more often in adolescents, while type 2 diabetes can occur at any age, but is most common after the age of 40. 3. Symptoms: Typical symptoms of diabetic patients are three more and one less, i.e., more drinking, more eating, more urination and weight loss. Ketoacidosis is also one of the acute complications of diabetes mellitus, which mostly occurs in type 1 diabetes mellitus patients, and is an important feature distinguishing it from type 2 diabetes mellitus. 4. Treatment: Type 1 diabetes requires lifelong use of insulin therapy, type 2 diabetes can generally take oral medication, oral medication is not effective can be used when insulin therapy. Type 2 diabetes can be treated with oral medication if oral medication is not effective. Diabetes types need to be differentiated by specialized doctors. Regular monitoring of blood glucose changes is needed in daily life, and abnormalities in blood glucose should be treated in time.