Elderly diabetes mellitus may have no obvious symptoms, or it may manifest itself in the form of three more and one less symptom, itchy skin and other symptoms. 1. Three more and one less symptom:Elevated blood glucose causes osmotic diuresis, leading to increased urine output. More urine leads to water loss, and the patient is thirsty and drinks more. The body is unable to utilize glucose, and protein and fat consumption increases, causing weight loss. In order to replenish sugar and maintain physical activity, patients are often easily hungry and overeat. 2. Itchy skin:Hyperglycemia and peripheral neuropathy lead to dry skin and abnormal sensation, and there may be itchy skin. Female patients may have vulvar itching due to the stimulation of local skin by urinary glucose. 3. Other symptoms: diabetes in the elderly can also appear weakness, numbness of the limbs, vision loss, blurred vision, blindness, slow healing of skin ulcers and so on. It is important to note that if the elderly appear the above symptoms of diabetes, should go to the hospital in a timely manner to identify the cause of the disease, active treatment, so as not to delay the condition.