Very yellow urine may be caused by drinking less water, urethritis, hepatocellular jaundice, etc. You can drink more water or take levofloxacin tablets, ursodeoxycholic acid capsule and other medicines are better. 1. Drinking less water: Because of drinking less water in general, less urine is formed after reabsorption through the kidneys. The color of urine changes after it is concentrated, so the urine is very yellow. You can drink more water in moderation, and the color of urine will return to normal. 2. Urethritis: As the urethra is infected by inflammation, it causes metabolites, which may also lead to very yellow urine. You can take levofloxacin tablets, cefaclor extended-release capsules and other drugs for treatment. 3. Hepatocellular jaundice: Hepatocellular jaundice will lead to increased urinary bilirubin and dark yellow urine. You can take ursodeoxycholic acid capsule and other drugs for treatment. If the urine is very yellow and cannot be relieved after drinking moderate amount of water, you should go to the hospital in time and follow the doctor’s instructions. All medications should be used under a doctor’s supervision.