Pale or clay-colored poop

Pale, clay-colored or putty-colored poop usually means bile is not reaching the stool. Bile is what makes stool brown, so when the liver makes less of it or its path into the gut is blocked, stool loses its color. A single pale stool, or a few days of light stool after a barium test, is not unusual. Pale stool that lasts more than a few days needs a clinician, right away if it comes with yellow skin or eyes and dark urine. In babies, pale or white stool needs a prompt call to the pediatrician.

See the pattern, not just the moment: Stoolio's Color Assessment includes a pale shade and dates every scan, so you can see exactly how many days in a row your stool has been pale. Your first three scans are free.

Why can poop be pale?

MedlinePlus explains that the liver releases bile salts into the stool, giving it its normal brown color. If you have a liver infection that reduces bile production, or if bile flow out of the liver is blocked, stool can turn pale, clay or putty-colored. Mayo Clinic describes it the same way: a lack of bile in stool, which may indicate a bile duct blockage. Pale stool is often paired with yellow skin (jaundice) and dark urine, because bilirubin that cannot leave through the gut shows up in the skin and urine instead.

Common explanations

• Barium from imaging tests. After an upper or lower GI X-ray series, NIDDK notes stools may be white or light-colored for several days. That is expected.
• Some medicines. Mayo Clinic lists antacids with aluminum hydroxide, large doses of bismuth subsalicylate and other anti-diarrheal drugs.
• Fat that was not absorbed. Fatty stool (steatorrhea) can look pale and greasy, float and be hard to flush. See yellow poop for more.
• Bile duct problems, such as gallstones, narrowing of the ducts, cysts or tumors of the liver, bile ducts or pancreas (MedlinePlus, Cleveland Clinic).
• Liver conditions, such as viral or alcohol-related hepatitis, cirrhosis, fatty liver disease or cholestasis, including cholestasis of pregnancy.

Foods and pale poop

Food is a less common explanation for pale stool than for other colors. Cleveland Clinic notes that drinking a lot of dairy can occasionally contribute, and some pediatric guidance mentions a milk-only diet. If you cannot connect pale stool to a barium test or a medicine, do not assume it is diet.

Pale stool in babies

This is the one situation where speed really matters. Pale yellow, gray, white or clay-colored stool in a baby can be a sign of biliary atresia, a blockage of the bile ducts that usually shows up between 2 and 8 weeks of age, often with dark urine and yellowing skin. Surgery works best when done before 8 weeks. The AAP says white poop needs to be brought to a doctor as soon as possible, and the NHS advises keeping a sample to show the midwife or doctor. Taiwan's national stool color card program, which gives new parents a printed card to compare against, helped raise the share of babies diagnosed before 60 days from 72.5% to 97.1%.

When to check in with a clinician

• Pale stool for more than a few days without a barium test to explain it (Cleveland Clinic, MedlinePlus).
• Pale stool with yellow skin or eyes and dark urine: contact a healthcare provider right away.
• Pale stool with greasy, floating, foul-smelling stool that keeps happening.
• Any pale, white, gray or clay-colored stool in a baby: call the pediatrician promptly.

Cleveland Clinic notes that light-colored poop once, or once in a while, is not typically a cause for concern in adults. The pattern is what matters.

What Stoolio looks at visually

Pale is the lightest of the six shades in Stoolio's Color Assessment, alongside light brown, brown, dark brown, green and very dark. Because every scan is dated, the question that matters most for pale stool, "how many days has it been?", has an exact answer, and the record can be exported to show a clinician. A scan is a visual estimate, not a test of liver or bile function; if pale stool persists, the next step is a professional. For a baby, do not wait on an app: call the pediatrician. See the full poop color chart.

Sources

1. MedlinePlus. Stools - pale or clay-colored.
2. Cleveland Clinic. Clay Colored Stool (Pale Stool).
3. Mayo Clinic. Stool color. 2024.
4. Hoilat GJ, John S. Bilirubinuria. StatPearls. 2023.
5. NIDDK. Upper GI Series.
6. Cleveland Clinic. Steatorrhea (Fatty Stool).
7. Cleveland Clinic. What Does My Stool (Poop) Color Mean?
8. MedlinePlus. Biliary atresia.
9. NIDDK. Symptoms & Causes of Biliary Atresia.
10. AAP HealthyChildren. The Many Colors of Baby Poop.
11. NHS. Newborn jaundice.
12. Hsiao CH, et al. Universal screening for biliary atresia using an infant stool color card in Taiwan. Hepatology. 2008.