Greasy stool (oily, shiny, foul-smelling, or floating stool) indicates excess fat in the stool. A single episode after a fatty meal is common, but repeated or persistent greasy stools merit evaluation. Below is general information on recognition, likely causes, diagnostic approaches, and where to seek specialist care.
Greasy stool may appear shiny or oily, sometimes frothy, and can leave an oily film on the water or on toilet paper. It may smell particularly foul and occasionally float. While an occasional episode after a high‑fat meal can occur, persistent changes in stool quality or frequency should prompt assessment.
Several conditions can cause greasy stool: pancreatic exocrine insufficiency, problems with bile flow, intestinal malabsorption, certain infections, and side effects of some medications. Primary care (family medicine) is a reasonable first contact. If further investigation is needed, gastroenterology, infectious diseases/clinical microbiology, or other specialty services may be involved.
Evaluation usually begins with a clinical history and physical exam focused on stool features, weight change, and associated symptoms. Typical tests include stool analysis and quantitative or qualitative fecal fat testing, blood tests for nutritional markers, abdominal ultrasound or other imaging, and, when indicated, endoscopy or pancreatic function testing. The exact sequence of tests depends on clinical findings.
Seek urgent medical attention if greasy stool is accompanied by high fever, severe abdominal pain, rapid or unexplained weight loss, bloody stool, fainting, or marked deterioration in general condition. For scheduled appointments, note stool appearance and frequency, recent diet and medications, associated symptoms (pain, fever, weight change), and any relevant medical history to help clinicians direct testing.
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