The possible causes of yellow urine with foam and odor are: 1. Urinary tract infection, urine containing more bacterial metabolites, or containing more pus cells and white blood cells, etc., there will be an increase in urine foam with abnormal odor, and a deepening yellow urine color, accompanied by urinary frequency, urinary urgency and other urinary tract irritation symptoms, you need to retain urine and do routine urine examination to confirm the diagnosis. 2. The increase of protein content, bilirubin or urine sugar level can lead to an increase of urine foam, accompanied by a certain abnormal odor, and a deepening of urine color, usually without urinary tract irritation symptoms, etc. Edema of the limbs and face can appear, or the smell of rotten apples in urine can appear, mostly related to metabolic factors, and requires a comprehensive assessment of routine urine examination, quantitative measurement of urine protein, and blood sugar examination.