Dark brown urine meaning: common explanations

Urine becomes darker when it is concentrated, such as after sweating, vomiting, diarrhoea, fever, or drinking less than usual. Brown or cola-coloured urine can also result from bile pigments, bleeding anywhere in the urinary tract, or pigment released after muscle injury. Some medicines and foods alter urine colour. The shade seen in a toilet can be affected by lighting, cleaning products, and how long the urine has stood. Ask whether the change is present every time, whether it started suddenly, and whether there is burning, urgency, pain, fever, yellow eyes, pale stools, or muscle soreness.

Check the colour in a clean container if you need a clearer view, and note its timing. If you feel well and have a clear reason for fluid loss, drink regular fluids unless a clinician has told you to restrict them. Review recent medicines and supplements with a pharmacist or doctor; do not discontinue prescribed treatment on your own. Arrange an appointment when brown urine is unexplained, keeps returning, or comes with other symptoms. Urine testing can look for blood, infection, concentration and bile-related changes, while blood tests may assess kidney, liver and muscle health.

Get urgent medical help for severe pain, fever with feeling very unwell, inability to urinate, very little urine, repeated vomiting, fainting, confusion, or new yellowing of the eyes or skin. Seek prompt assessment after strenuous exercise if dark urine is accompanied by muscle pain, swelling or weakness. A mild colour change that quickly clears after replacing lost fluids still deserves review if it returns or has no obvious explanation.

Which causes fit my colour change and other symptoms? Do I need urine testing or blood tests? Could any medicine or supplement be contributing? How much should I drink given my health conditions? What change in urine colour or output should prompt same-day care?