Dark brown urine in the morning

Several hours without drinking gives the kidneys time to conserve water, so the first urine may be darker and stronger-smelling than later samples. A dry mouth, thirst, headache, sweating, or recent vomiting can support dehydration as an explanation. Brown or cola-coloured urine is different from ordinary deep yellow urine and may also reflect blood, bile pigments, muscle breakdown, or a medicine effect. Hepatitis A and hepatitis B can be associated with dark urine when liver inflammation affects bile handling, but colour cannot diagnose either condition.

Notice whether the colour lightens after normal morning fluids and whether it returns on the next day. Write down drinks, medicines, supplements, exercise, pain, fever, and changes in bowel or urinary habits. Keep drinking normally unless a clinician has prescribed fluid restriction. Do not delay advice simply because the urine appears clearer later if the morning change keeps recurring.

Arrange prompt care for brown urine that lasts through the day, repeatedly returns, or is accompanied by yellow skin or eyes, pale stools, fever, burning, side pain, swelling, or reduced urine. Emergency help is needed for confusion, fainting, severe pain, heavy bleeding, or inability to urinate.

Ask whether the shade suggests concentrated urine or another pigment, whether your medicines need checking, and whether a first-morning urine sample, blood test, or liver assessment would clarify the cause.