Dark yellow urine first thing in the morning

Urine commonly looks darker after sleep because you have not been drinking and the kidneys conserve water. It should usually become lighter as you drink through the day. Colour can also change with vitamins, medicines, or foods. Dark urine that remains unusual may reflect dehydration or, less commonly, a liver or other health problem. Colour alone cannot identify the cause, so notice smell, pain, fever, and changes in bowel movements or the eyes.

Drink fluids regularly and check whether the colour lightens later. Replace fluids steadily after heat, exercise, sweating, vomiting, or diarrhoea. Avoid forcing large amounts quickly if that makes you nauseated. Review any new supplements or medicines with a pharmacist rather than stopping prescribed treatment yourself. Note how long the change lasts and whether urine is brown, tea-coloured, cloudy, painful to pass, or unusually strong-smelling.

Arrange medical advice if dark urine continues despite normal drinking, keeps returning, or comes with burning, urgency, side pain, fever, or unusual tiredness. Seek urgent care for very little urine, confusion, fainting, severe weakness, severe pain, or vomiting that prevents drinking. Yellow skin or eyes, pale stools, or tea-coloured urine should be assessed promptly because they can point to a liver or bile-flow problem.

Ask whether your fluid intake, supplements, symptoms, or medical history suggest a urine test or blood tests, and what warning changes should prompt faster review.