What should you know about significance of dark urine?

Urine may look darker after sweating, vomiting, diarrhoea, fever, or simply drinking less. Concentrated urine often becomes lighter after regular fluids and rest. Brown, tea-coloured, red, or smoky urine can have other explanations, including blood, muscle breakdown, or bile pigments. Some foods, vitamins, and medicines also alter colour. Dark urine is a common presentation of dehydration, while hepatitis A and hepatitis B can affect urine colour alongside liver-related symptoms such as yellowing of the skin or eyes, nausea, or unusual tiredness.

Notice when the colour started, whether it changes after drinking fluids, and whether you have pain, fever, vomiting, reduced urination, yellow skin, or pale stools. Drink fluids regularly unless a clinician has told you to restrict them. Avoid strenuous exercise while urine is unusually dark, and do not stop prescribed medicines without advice. Arrange a clinical review if the colour persists, keeps returning, or has no clear explanation.

Seek urgent medical help for dark urine with severe abdominal or back pain, confusion, fainting, very little urine, repeated vomiting, or yellowing with marked illness. Blood-coloured urine, fever with shaking chills, or dark urine after heavy exertion also deserves prompt assessment. A clinician may examine you and request urine or blood tests to identify the cause.

Ask which causes fit the colour and timing, whether urine testing is needed, and whether any medicine, supplement, exercise, or recent illness could explain the change.