Possible reasons for the smell of ammonia in urine: First, patients with urinary retention or prolonged urinary retention can have an ammonia odor after urination, because of the decomposition of urine in the bladder after prolonged urinary retention and the formation of ammonia-like substances after the decomposition of proteins in urine, so there will be an ammonia odor after urination. After drinking more water, this situation can be improved, generally not accompanied by urinary irritation symptoms, will not appear urinary frequency, urinary urgency, painful urination. Second, when urinary tract infection occurs, the smell of ammonia in urine can appear, because there are more bacteria in the urine, bacteria decompose the protein in the urine to form ammonia substances, so the smell of ammonia can appear when urinating, accompanied by urinary frequency, urinary urgency, painful urination, can be accompanied by cloudy urine and other changes. Routine urinalysis can show a significant increase in the number of bacteria or white blood cells. Thirdly, high protein diet or meat diet can cause ammonia odor in urine, eating meat diet or protein diet can cause the microprotein content in urine to increase, if the protein decomposition in an acidic environment will produce ammonia substances, ammonia odor can be slightly reduced or disappear after adjusting the diet structure.