Urine too yellow may be caused by drinking too little water, but also may be caused by choledocholithiasis, carotenemia and other diseases. 1. Drinking too little water:Patients in daily life, if drinking too little water, intake of water is not up to the normal need of water, will lead to the body too little water, the phenomenon of urine concentration, so patients will appear urine too yellow symptoms. 2. Choledochal stones:Choledochal stones are caused by a variety of factors such as biliary tract infection and bile duct stenosis. Patients will have abdominal pain, high fever, jaundice and other symptoms. Jaundice will lead to the phenomenon of darker urine and lighter feces, so the patients will have the symptom of too-yellow urine. 3. Carotenemia:Carotenemia is caused by high levels of carotene in the blood, and patients will have symptoms such as excessive excretion of carotene in the urine, yellowing of the skin and nausea. As a result, patients may experience urine that is too yellow. Urine too yellow may also be caused by other factors, after the exclusion of physiological factors, it is recommended that patients go to the regular hospital in a timely manner to seek treatment, in order to achieve early recovery.