What causes urine to smell bad?

Urine smell heavy related to usually drink less water, but also may be the emergence of urinary tract infection, diabetes, phenylketonuria and other diseases.
1. Drinking less water: usually if you often drink less water, urine concentration, may appear this symptom, at the same time if often strenuous exercise, sweating too much, may lead to this symptom.
2. urinary tract infection: clinically, urinary tract infection after the urinary system is stimulated by inflammation, may lead to increased inflammatory secretions, bacterial growth, so there may be urine odor heavy symptoms.
3. Diabetes: some patients with diabetes due to elevated blood glucose levels in the body, higher blood glucose content in the urine, so this symptom will occur.
4. Phenylketonuria: If the phenylketonuria body phenylalanine metabolism is abnormal, may lead to heavy urine odor.
If the symptoms of heavy urine odor occur frequently, you need to consult a doctor in time for examination and treatment.