There is no severity grading for diabetes mellitus. Generally, diabetes mellitus is clinically categorized into two types: Type I diabetes mellitus and Type II diabetes mellitus. 1. Type I diabetes, which is common in adolescents, is usually poorly treated with oral medications and requires insulin injections. 2. Type II diabetes, accounting for the majority of the diabetic population, is common in middle-aged and elderly people, accompanied by hypertension, dyslipidemia, atherosclerosis and other diseases. Early clinical manifestations are not obvious, or just weakness and thirst, you need to go to the hospital to do a glucose tolerance test to determine whether it is diabetes. Regardless of the type of diabetes mellitus, there are a variety of clinical treatments available to control blood glucose concentration, and patients themselves need to change their lifestyle and dietary habits to assist in the treatment.