Possible causes of soy-colored urine are as follows: 1. Crush injuries to the kidneys, massive burns, hemolytic anemia, etc., can appear as soy-colored or brownish changes in the urine, due to the destruction of hemoglobin, which enters the urine and appears as soy-colored urine. 2. Hemolysis after transfusion of the wrong blood type, or hemolysis after heavy metal poisoning, can appear as soy-colored urine, due to the destruction of red blood cells, which can appear as soy-colored urine. The urine can also appear soy sauce-colored within a short period of time after strenuous exercise.4. Paroxysmal sleep hemoglobinuria can be common after waking up from sleep, and the urine is tan or soy sauce-colored.5. Fava bean disease, certain congenital genetic diseases lead to the lack of 6-phosphoglucose dehydrogenase in the red blood cells of patients, so patients appear soy sauce-colored urine after eating fava beans or green beans, which has a certain heredity.