What should you know about dark yellow stinky urine?

Urine becomes darker and more noticeable in smell when it contains less water. Heat, sweating, vomiting, diarrhoea, a long period without fluids, or some supplements can contribute. Foods and medicines can also alter smell. An unusual smell with burning, frequent urination, lower abdominal pain, or cloudy urine can occur with a urinary infection. Dark brown urine, yellowing of the eyes or skin, pale stools, nausea, or marked tiredness can point to a liver or bile problem and should not be dismissed. The symptom itself does not identify one cause.

If you feel well and have no fluid restriction, drink water regularly and notice whether the next several urinations become paler. Replace fluids gradually after sweating rather than drinking a large amount at once. Avoid using leftover antibiotics or scented products to mask the smell. Note when the change began, what you drank, recent exercise, new medicines or supplements, and any pain or fever. Arrange a clinical review if the smell or colour persists despite normal drinking, keeps returning, or is joined by urinary discomfort.

Seek urgent medical help for confusion, fainting, severe weakness, inability to keep fluids down, very little urine, or signs of heat illness such as hot skin with worsening dizziness. Get prompt assessment for fever with back or side pain, blood in the urine, severe pain, or yellow skin or eyes. People who are pregnant, very young, older, or living with kidney, heart, or liver disease should seek advice earlier because fluid needs and risks differ.

Could dehydration, an infection, a medicine, or a liver problem explain this change? Do I need a urine test or blood tests? Which warning signs should make me seek urgent care? How much fluid is suitable if I have another medical condition?