Diabetic patients’ urine especially stinks may be a normal physiological phenomenon, or it may be caused by diabetic ketoacidosis, urinary tract infection and other diseases. 1. Physiological phenomenon: normal human urine itself has a certain special odor, there can be ammonia odor. 2. Diabetic ketoacidosis: it is an acute complication of diabetes mellitus, which can be caused by acute infections, improper diet, trauma and other factors, and after the occurrence of acidosis, there can be a rotten-apple flavor in the urine, which leads to smelly urine. 3. Urinary tract infection: diabetic patients with poor blood sugar control is very easy to induce urinary tract infection, resulting in urine odor. Diabetic patients with particularly smelly urine can go to the hospital and ask the doctor to make a judgment and clarify the cause of the disease.