Diabetes mellitus should be examined in an endocrinology department and treated accordingly. Diabetes mellitus is a group of metabolic diseases caused by a variety of etiological factors, characterized by chronic hyperglycemia, mostly caused by defective insulin secretion or action, patients are often accompanied by the typical symptoms of “three more and one less”, that is, polyuria, polydipsia, polyphagia, weight loss, some patients may be accompanied by itchy skin, which is a typical endocrine disease, the patient should be checked for diabetes by the endocrinology department. Patients should go to the endocrinology department to check whether they have diabetes. If you suspect that you have diabetes mellitus, you should go to the endocrinology department of a regular hospital, follow the doctor’s instructions to complete the relevant examinations, and standardize the diagnosis and treatment under the guidance of a professional doctor.