The cause of itchy belly may be contact dermatitis, may also be diabetes caused by pruritus, high blood sugar does not necessarily occur belly itch, it is recommended to consult a doctor. 1. Contact dermatitis: belly contact with external material stimulation, localized erythema, redness, swelling and other allergic inflammation, feeling itchy. Antihistamines can be given for relief. 2. Pruritus caused by diabetes: long-term high blood sugar state may make the skin dry, the skin protective barrier is damaged, and ultimately lead to itchy skin. Therefore, it is recommended that diabetic patients control their dietary intake, monitor fasting blood glucose and 2-hour postprandial blood glucose daily, and actively give glucose-lowering drugs such as metformin extended-release tablets to control blood glucose. Pruritus is one of the common complications of diabetes. But high blood sugar does not necessarily lead to itchy skin. Blood glucose should be actively monitored when pruritus occurs in diabetic patients. It is recommended to consult a doctor if there is any discomfort, and give appropriate treatment under the guidance of the doctor.