The possible causes of smelly urine: First, the presence of purulent urinary tract infections, such as the presence of urethritis, cystitis or pyelonephritis, kidney abscess and other diseases, when the urine contains a lot of pus cells and bacterial metabolites, so there will be smelly urine. It can also be accompanied by symptoms such as frequent urination, urinary urgency, painful urination, etc. Routine urine tests and urine culture tests are needed to confirm the diagnosis. Second, if the diet is high in calories, high in sugar and frequent consumption of meat, etc., it can cause an increase in the protein content in the urine, when the few bacteria present in the urine decompose the protein, which can cause the urine to be more smelly. Generally not accompanied by irritation symptoms of the urinary tract, you need to adjust the structure of the diet, meat and vegetables, and minimize the high-calorie and high-protein diet, etc. Thirdly, if there are patients with long foreskin or circumcision, there are more local secretions, or accompanied by a lot of dirt, combined with local bacteria, can appear fishy odor when urinating. Most of the local pollution and lead to heavy smell, need to maintain good local personal hygiene, do diligent cleaning, if necessary, circumcision treatment.