Urine with a UTI most often looks cloudy or murky, but it can also turn pink, reddish, dark brown, or even milky white depending on the type and severity of the infection. The cloudiness comes from your immune system flooding the urinary tract with white blood cells to fight bacteria. In some cases, small amounts of blood mix into the urine, shifting the color toward pink or red.
Cloudy or Murky Urine
The most common visual change with a UTI is urine that loses its normal transparency. Instead of looking clear or pale yellow, it appears hazy, foggy, or opaque. This happens because the infection triggers your body to send white blood cells into the urinary tract. When enough of these cells accumulate in your urine, a condition called pyuria, the liquid turns visibly cloudy.
Bacteria themselves also contribute to the murky appearance. A urine sample with a high bacterial count looks different from sterile urine even before any lab testing. That said, cloudy urine isn’t always a UTI. Phosphate crystals that naturally form in alkaline urine can create the same hazy look, and simple dehydration can make urine appear darker and less clear. The key difference is that UTI-related cloudiness usually comes with other symptoms like burning, urgency, or an unusual smell.
Pink, Red, or Brown Urine
Blood in the urine is common with urinary tract infections. When the bladder lining becomes inflamed and irritated by bacteria, small blood vessels can leak, tinting your urine anywhere from faintly pink to noticeably red. The amount of color change depends on how much blood is present. Sometimes the blood is invisible to the naked eye and only shows up on a lab test.
Certain UTIs can also produce dark brown or cola-colored urine. This tends to happen when the infection is more severe or involves the kidneys rather than just the bladder. Brown urine can also signal liver or kidney problems unrelated to infection, so this color warrants prompt attention.
White, Green, and Other Unusual Colors
Some UTIs turn urine milky white, particularly when there’s a heavy concentration of white blood cells or discharge mixing with the urine. This is less common than cloudiness but distinctive when it happens.
Certain bacteria can even produce green-tinted urine. This is rare and caused by specific bacterial species that generate pigments as they multiply. If your urine turns green and you haven’t eaten anything with strong dyes, an infection is one possible explanation.
How UTI Urine Differs From Dehydration
Dark urine doesn’t automatically mean infection. When you’re dehydrated, your kidneys conserve water by producing more concentrated urine, which turns amber or honey-colored. This urine is darker but still clear, not cloudy. You can usually resolve it by drinking more fluids over a few hours.
UTI urine, by contrast, tends to be cloudy regardless of how hydrated you are. It also carries a stronger or more unpleasant odor. Concentrated urine from dehydration can smell like ammonia, but UTI urine often has a distinctly foul or unusual scent that goes beyond normal concentration. The combination of cloudiness, odor, and symptoms like burning or frequent urination points toward infection rather than simple dehydration.
Smell Changes That Accompany Color Changes
Along with visual changes, UTI urine frequently smells different. Bacteria breaking down compounds in your urine produce waste products that create a strong, sometimes foul odor. This is distinct from the normal ammonia smell that comes with concentrated urine. If your urine looks cloudy or discolored and also smells noticeably worse than usual, those two signs together are a strong signal of infection.
What Orange Urine Means During a UTI
If you’ve started taking an over-the-counter pain reliever for urinary burning (the kind that numbs the bladder lining), your urine will likely turn bright reddish-orange. This color change is a harmless side effect of the medication, not a sign that your infection is getting worse. The dye can stain clothing and contact lenses, so plan accordingly. The color returns to normal once you stop taking the medication.
This orange tint can make it harder to spot actual blood in your urine, which is one reason these medications are meant for short-term symptom relief while antibiotics treat the underlying infection.
When Urine Color Signals a Kidney Infection
A standard bladder UTI can cause any of the color changes described above. But when the infection travels upward to the kidneys, the situation becomes more serious. Kidney infections are more likely to produce bloody or dark brown urine, and they bring additional symptoms that a simple bladder infection doesn’t: fever, chills, and pain in your lower back or side. You may also feel suddenly and noticeably ill in a way that feels different from the discomfort of a bladder infection.
If your urine color changes are accompanied by back or flank pain, a fever above 101°F, or nausea and vomiting, the infection may have reached your kidneys. This requires prompt medical treatment because kidney infections can cause lasting damage or spread to the bloodstream if left untreated.