Common symptoms of diabetes mellitus: 1. Common basic symptoms, such as dry mouth, thirst, excessive drinking, polyphagia, polyuria, emaciation, etc. 2. Some common complications of diabetes mellitus, such as neuropathy, there will be numbness of the limbs, cold lower extremities, abnormal sweating of the lower extremities, dry and cracked skin, cold lower extremities, foot ulcers; such as cardiovascular lesions, there will be panic, chest tightness, fatigue, shortness of breath, etc.; gastrointestinal tract symptoms, there will be poor nausea, regurgitation, indigestion, etc.; cerebrovascular lesions, there will be dizziness, fatigue, etc. 3. The symptoms of gastrointestinal tract, such as nausea, regurgitation, dyspepsia, etc.; cerebrovascular lesions, such as dizziness, fatigue, etc.; renal lesions, such as proteinuria, nocturia, foamy urine, blurred vision, etc. 3. There are also some diabetic patients who will have sexual function abnormalities, such as impotence, premature ejaculation, menstrual disorders and so on.