Dark urine and strong odor: possible causes

When urine is concentrated, its normal smell becomes more noticeable and its colour deepens. Sweating, fever, vomiting, diarrhoea, or low fluid intake can contribute. A strong ammonia-like smell may occur when urine sits in the bladder or is concentrated. Burning, urgency, frequent small amounts, lower abdominal pain, or cloudy urine can occur with a urinary tract infection. A sweet or unusual smell can have several explanations and should be discussed if it persists. Brown or tea-coloured urine with yellow eyes or skin, pale stools, or marked nausea needs review because liver conditions can present with dark urine.

Drink fluids regularly unless a clinician has told you to restrict them, and observe the next few urinations. Think about recent exercise, heat exposure, illness, foods, vitamins, and medicines. Do not use leftover antibiotics or vaginal products to treat a urine change. Arrange testing if the odour or colour continues, returns repeatedly, or comes with urinary symptoms. A clinician may examine a urine sample and decide whether other tests are needed.

Get urgent care for fever with chills, pain in the side or back, vomiting that prevents drinking, confusion, fainting, very little urine, visible blood, or yellowing of the skin or eyes. Pregnancy, kidney disease, or rapidly worsening symptoms lowers the threshold for contacting a clinician.

Ask whether you need a urine culture, whether any medicine or supplement could explain the smell, and how to recognise a urinary infection that has moved beyond the bladder.