Diabetic itch is not necessarily all over the body. Patients with diabetes, especially middle-aged and elderly people with poor glycemic control can experience generalized itch. And microangiopathy, neuropathy and other causes can lead to localized itch, such as calves. 1. Generalized itch: the blood sugar level of diabetic patients is higher than that of the normal population, and impaired glucose metabolism, high levels of blood glucose with the blood flow through the body, at this time, the excess sugar can be discharged through the skin or sweat, the skin and mucous membranes after the accumulation of a certain amount of sugar will lead to generalized itchy symptoms appear. 2. Local itch: when diabetes microangiopathy, neuropathy and other complications, patients will appear local itching, such as calves. In conclusion, diabetic patients with itchy symptoms should actively measure their blood glucose, consult a doctor in time, and adjust and regularly use medication to control their blood glucose level within the ideal range.