Urine discoloration - Causes, Treatment & When to See a Doctor

What is Urine Discoloration?

Urine discoloration refers to any change in the normal pale‑yellow color of urine. While the typical hue is produced by the pigment urochrome, variations can result from the concentration of the urine, dietary factors, medications, or underlying medical conditions. The change may be temporary (e.g., after eating beets) or persistent, signalling a health issue that may need investigation.

Because urine is easily observable, it often serves as an early “window” into the body’s metabolic and renal status. Recognizing patterns of discoloration—such as a gradual darkening, a sudden pink tint, or a cloudy appearance—helps clinicians narrow down potential causes.¹

Common Causes

Many different factors can alter urine color. Below are the most frequent reasons, grouped by the type of pigment or substance involved.

• Dehydration / Concentrated urine – Dark amber or orange urine occurs when fluid intake is low, concentrating urochrome.
• Dietary pigments – Beets, blackberries, rhubarb, or asparagus can produce pink, red, or green tinges.
• Medications and supplements – Rifampin, phenytoin, sulfonamides, certain antimalarials, vitamin B complex, and laxatives may cause orange‑red, brown, or green urine.²
• Hematuria (blood in urine) – Bright red or cola‑colored urine due to bleeding anywhere along the urinary tract.
• Myoglobinuria – Dark brown or “tea‑colored” urine after muscle injury, rhabdomyolysis, or strenuous exercise.
• Uroporphyrinuria (porphyria) – Red‑brown urine that darkens on exposure to light, linked to disorders of heme synthesis.
• Gallbladder or liver disease – Deep amber or brown urine caused by excess bilirubin (bilirubinuria).
• Urinary tract infection (UTI) – Cloudy urine with possible pink or red streaks from inflammatory cells and blood.
• Kidney stones – May cause intermittent blood in urine, leading to pink or red coloration.
• Certain cancers – Bladder, kidney, or prostate cancers can present with painless hematuria.

Associated Symptoms

Changes in urine color rarely occur in isolation. The presence of