The urine smells like ammonia, possible causes: 1, long time holding urine state, the urine appears concentrated, the substances in the urine is decomposed into ammonia, can appear urine has ammonia smell. 2, the diet contains more protein, or contains more meat, protein is decomposed into amino acids, in the urine contains nitrogen amino acids are decomposed, can appear ammonia, appear urine has ammonia smell. It is necessary to adjust the diet structure, appropriate diet, and eat less meat-based diet.3. If there is urinary tract infection, bacteria can break down the protein in the urine into ammonia and hydrogen ions, and there can be an ammonia smell in the urine. It can also be accompanied by cloudy urine, or symptoms such as frequent urination, urgent urination and painful urination. Routine urine tests and urine culture tests are needed to confirm the presence of a bacterial infection.