Orange urine is usually a sign of dehydration, but it can also result from certain foods, vitamins, medications, or less commonly, a liver problem. In most cases, the cause is harmless and temporary. The color of your urine comes from a yellow pigment called urochrome, a waste product your body makes when it breaks down old red blood cells. When that pigment gets more concentrated, your urine shifts from pale yellow toward amber, deep gold, or orange.
Dehydration Is the Most Common Cause
When you’re not drinking enough water, your body holds onto fluid by producing less urine. The urochrome pigment stays the same, but it’s dissolved in much less water, making the color more intense. Research published in Frontiers in Nutrition confirmed this relationship: as urine concentration increases, pigmentation shifts in a straight line from light yellow toward deep yellow and orange. The more dehydrated you are, the darker and more concentrated your urine becomes.
This is especially common after sleeping (when you haven’t had water for hours), after intense exercise, during hot weather, or if you’ve had alcohol or caffeine without enough water alongside it. If dehydration is the cause, drinking a few glasses of water over the next hour or two should bring your urine back to a pale straw color. If it doesn’t lighten up after rehydrating, something else is likely going on.
Foods and Supplements That Turn Urine Orange
Beta-carotene, the pigment that makes carrots, sweet potatoes, and squash orange, can do the same to your urine. Eating large amounts of these foods gives your body more of this pigment than it needs, and the excess gets filtered out through your kidneys. The effect is harmless and clears up once you cut back.
High-dose B vitamins are another common culprit, particularly vitamin B2 (riboflavin), which is intensely yellow and can push urine into bright yellow or orange territory. Large doses of vitamin C can have a similar effect. If you recently started a new multivitamin or B-complex supplement, that’s a likely explanation.
Medications That Cause Orange Urine
Several widely used medications are known to change urine color to orange or reddish-orange. This is a predictable side effect, not a sign of harm.
- Phenazopyridine is a bladder pain reliever often used alongside antibiotics for urinary tract infections. It’s a dye that turns urine reddish-orange, sometimes vividly so. The color change starts quickly after the first dose and stops once you finish the medication.
- Rifampin, used to treat tuberculosis and some other infections, turns urine, sweat, and even tears orange. The CDC notes that it can permanently stain soft contact lenses, so doctors typically advise removing them during treatment.
- Sulfasalazine, prescribed for inflammatory bowel disease and rheumatoid arthritis, can turn urine and skin a yellow-orange color. This discoloration is a known, harmless side effect of the drug itself.
- Senna-based laxatives contain plant compounds that can shift urine to a red-brown or orange-brown color. According to the NHS, this is harmless and goes away after you stop taking the laxative.
If you started any new medication in the days before noticing the color change, check the information leaflet or ask your pharmacist. Many drugs list urine discoloration as a common side effect.
When Orange Urine Signals a Liver Problem
Less commonly, orange or dark urine can be an early warning sign of liver or bile duct trouble. Here’s why: your liver processes a waste product called bilirubin, which is normally broken down and excreted through your stool (it’s what gives stool its brown color). When the liver is damaged or a bile duct is blocked, bilirubin builds up in the blood instead. Because this form of bilirubin dissolves in water, your kidneys start filtering it out, and it ends up in your urine, darkening it to an orange or brownish color.
The important thing is that liver-related orange urine rarely shows up alone. It typically comes with a cluster of other symptoms: pale or clay-colored stools (because the bilirubin isn’t reaching the intestines), yellowing of the skin or whites of the eyes, and sometimes persistent itching. Bilirubin in urine can actually appear before other symptoms of liver damage become obvious, which is why unexplained dark urine shouldn’t be ignored if it persists.
Conditions that can cause this pattern include hepatitis, cirrhosis, gallstones blocking the bile duct, and pancreatic problems that compress the bile duct. A simple urine dipstick test can detect bilirubin, and if it’s positive, further blood work and imaging can pinpoint the cause.
How to Tell What’s Causing It
Start with the simplest explanation. Think about what you ate, drank, or took in the last 24 hours. Then try drinking two to three extra glasses of water and check your urine color a few hours later. If it returns to pale yellow, dehydration was the answer.
If the orange color persists for more than a day or two despite good hydration and no obvious dietary or medication cause, pay attention to the rest of your body. The Mayo Clinic specifically flags two situations worth prompt medical attention: orange or dark urine paired with pale stools and yellow skin or eyes (which points to a liver issue), and any visible blood in the urine, which can sometimes look orange or reddish and may indicate a urinary tract infection, kidney stone, or other condition that needs evaluation.
A single episode of orange urine after a night of poor hydration or a big dose of B vitamins is nothing to worry about. A pattern of persistently dark or orange urine, especially with other symptoms, is worth investigating with a basic urinalysis and blood panel.