Men with yellow urine, possible causes: a. When the urine is concentrated state, yellow urine may appear. If you have not drunk water for a long time or have lost too much body fluid and have not replenished water in time or have held urine for a long time, you will have yellow urine when you urinate, so you need to replenish water appropriately and urinate more. Second, oral administration of a large number of antibiotics, such as sulfonamide antibiotics or oral administration of vitamin B complex, B vitamins and other drugs may cause yellowing of urine, after stopping the intake of related drugs, the color of urine will return to normal. Third, suffering from jaundice diseases, such as liver or biliary tract diseases, there is an elevated serum bilirubin level, which can also appear yellow urine color. A large amount of bilirubin, urobilinogen, etc. is visible in the urine, and the patient is accompanied by yellow staining of the skin and sclera of the whole body. Tests of the liver, biliary tract and serum bilirubin level are needed to rule out jaundice.