Diabetic patients are prone to dry mouth, excessive drinking and polyuria. The specific amount of urine is related to the degree of elevated blood sugar and the amount of water consumed. A normal person’s urine output is about 2,000ml a day. If it is polyuria, it can be manifested as an increase in the volume of urine and an increase in the number of times. Generally, urinating more than 5 times is considered polyuria. Most normal people are within 5 times a day. If polyuria occurs, you should go to the hospital as soon as possible to check urine routine and blood sugar to check whether there will be elevated blood sugar and urine sugar. If the elevated blood sugar reaches the diagnostic standard of diabetes, it can be considered as diabetes. Secondly, patients with polyuria should usually pay attention to the presence of urinary tract infections, and if they have urinary tract infections, the number of urination will also increase, and should be identified. For example, the urine volume of patients with urolithiasis may even reach more than 5000-6000ml a day, which is very high and can usually be roughly judged by urinary routine. Diabetic patients will have a higher specific gravity of urine, while uremic patients have a significantly lower specific gravity of urine, which can also be identified through this.