The common types of diabetes mellitus are type 1 diabetes mellitus and type 2 diabetes mellitus, which also includes gestational diabetes mellitus and other special types of diabetes mellitus. 1. Type 1 diabetes: mainly due to the destruction of pancreatic β-cells, resulting in the absolute lack of insulin due to diabetes, most of the patients start young, the main symptoms of polyuria, polyphagia, polydipsia, high blood glucose, some patients with ketoacidosis as the first symptom, the treatment of oral medication is ineffective, the need to use insulin. 2. Type 2 diabetes mellitus: patients with insulin resistance, accompanied by insulin progressive secretion insufficiency, mostly in the middle-aged and elderly, hypertension, hyperlipidemia, obesity, higher incidence, the onset of insidious, can be under the guidance of the physician oral medications such as metformin, acarbose and other drug therapy. In addition to the above two common types, there are other types such as gestational diabetes, mitochondrial gene mutation diabetes, etc.; regardless of the type, it is necessary to consult a doctor in a timely manner, standardized treatment, and not self-medication.