Possible reasons for yellow urine and a heavy odor: a. The presence of concentrated urine. If you have not drunk water for a long time, hold urine for a long time, appear to have more sweating and more loss of body fluids, etc., you can have yellow urine with a heavier odor. In patients who have not urinated for a long time, some esters in the urine volatilize and can form a stronger odor. Second, if there is a urinary tract infection, yellowish color accompanied by an increased odor can also occur. Because of the presence of cellular metabolites in the urine, some bacteria decompose the proteins in the urine, leading to an increase in the odor of the urine, accompanied by cloudiness and yellowing of the urine. At the same time, it can be accompanied by discomfort such as frequent urination, urgent urination and painful urination, which requires routine urine examination to confirm the diagnosis. Third, if the urine contains more bilirubin, urobilinogen, etc., it can also cause yellow color and accompanied by a certain odor, need to carry out a bilirubin test to confirm the diagnosis. Fourth, patients suffering from diabetes, urinary sugar content in the urine is elevated, which will lead to an abnormal odor.