Drinking milk does not cause foam to appear in the urine. The main component of milk is protein, and the protein will be destroyed by gastric acid when the milk is drunk through the stomach, which will not affect the reabsorption of the kidney tubules, so drinking milk will not have a significant effect on the urine, and drinking too much milk will only increase the volume of urine. The foam in the urine may be a urinary tract infection or prostatitis, which can be relieved by taking oral anti-inflammatory drugs. If a diabetic has foam in the urine after drinking milk, it may be diabetes that causes damage to kidney function or kidney disease, so you need to pay attention to a light diet on a regular basis and have your blood sugar checked regularly. Drinking milk will not lead to foam in the urine, if foam appears, it is recommended to go to a regular hospital for examination to determine the cause and specific treatment to avoid delays in the condition.