Most of the patients’ exhaled gas with ammonia odor is caused by the advanced stage of renal failure, which will be alleviated after dialysis. Mainly because of uremia, renal failure can not be metabolites out of the body in a timely manner, will be gathered in the body, part of the metabolites will be excreted through respiration, the metabolites will have urea components, then the exhaled gas will have an ammonia odor. Patients with more serious symptoms will have anuria, blurred consciousness, drowsiness, and also loss of orientation, which can cause nausea, vomiting, itching of the skin, as well as the failure of other organs. Need to go to the hospital for a comprehensive examination, mainly to do routine urine, but also need to do serum urea nitrogen, creatinine test, the more serious symptoms need to do hemodialysis treatment.