Diabetes is getting thinner and thinner may indicate poor glycemic control, long-term poor glycemic control may induce a series of complications such as atherosclerosis, diabetic foot, diabetic microangiopathy and other complications as well as malnutrition, a serious threat to the patient’s health. Prompt medical attention is recommended. Diabetes mellitus due to elevated blood glucose may cause excessive drinking, polyphagia, polyuria, weight loss and a series of symptoms, through oral acarbose, metformin and other hypoglycemic drugs or injectable insulin therapy, blood glucose control in a reasonable range of body weight loss can be controlled; if there is a more and more thin symptoms may indicate that poor glycemic control can also lead to malnutrition. At the same time, long-term poor glycemic control may induce diabetic nephropathy, chronic kidney disease is the main cause of end-stage renal failure; also cause atherosclerosis, resulting in coronary heart disease, ischemic or hemorrhagic stroke; diabetic foot, resulting in foot deformities, pain, ulcers and so on. Diabetic patients who appear to be getting thinner and thinner are advised to go to the hospital and ask the doctor to make a judgment.