One of the routine urine tests is a urinary bilirubin test, and a negative or weakly positive test is within the range of normal values. If the urobilinogen is strongly positive, further tests are needed. There are many reasons for weakly positive urinary bilirubinogen: First, when suffering from hemolytic jaundice or other hemolytic diseases, bilirubin excretion increases, bilirubin action in the intestine is converted into urobilinogen, excess urobilinogen is reabsorbed by the intestinal mucosa and returns to the liver, the liver is unable to convert it all into bilirubin or the liver is damaged at the same time, excess urobilinogen is excreted through the kidneys, and urinary urobilinogen in the urine increases and is positive or weakly positive. Second, abnormal liver function and impaired absorption of urobilinogen will lead to excessive urobilinogen excretion from the urine, resulting in a weakly positive urobilinogen expression. Third, malaria, constipation, severe burns, and cardiac insufficiency can also cause weak positive urobilinogen. Fourth, under normal circumstances, urobilinogen may also be weakly positive, such as after a meal or alkaline urine. In this case, patients need not worry excessively, it is not a pathological condition and can be reviewed regularly without treatment.