Our Services
Medical Information
Helpful Resources
Published on: 8/20/2026
Why does my poop smell like metal?
Poop can smell like metal when iron interacts with your digestive system. This commonly happens for two reasons: taking iron supplements, or gastrointestinal bleeding releasing iron from blood into the gut. As iron moves through your digestive tract, it reacts with bacteria and produces a distinct metallic odor.
While iron supplements are usually harmless, a metallic-smelling stool paired with dark or tarry appearance may signal internal bleeding, which requires prompt medical attention. Other causes include certain foods, medications, or infections affecting gut bacteria.
Because symptoms vary widely and some causes are serious, understanding your specific situation matters. Take a free, instant, online symptom check to clarify possible causes and get personalized guidance on your next steps—it takes just a few minutes and could help you decide whether home care or a doctor's visit is right for you.
Reviewed for medical accuracy: 07/15/2026
Quick answers
Frequently Asked Questions
4 answersThe most common questions people search after this page
Concerned about your symptoms?
Explanation
Inside your gut, tiny bacteria called microbes help break down the food you eat. When you take iron supplements, the extra iron can change how these microbes work and sometimes cause your poop to have a metal-like smell.
Iron has its own strong odor, and when it mixes with the natural process of digestion, it can make your stool smell metallic. Bleeding in your stomach or intestines can also cause this smell as blood is rich in iron.
If you develop stool with a metallic smell, particularly if associated with other symptoms like abdominal pain or fatigue, you can use this free symptom checker to help identify possible causes before consulting with a doctor.
(References)
Bloor SR, Schutte R, Hobson AR. Oral Iron Supplementation—Gastrointestinal Side Effects and the Impact on the Gut Microbiota. _Microbiology Research_. 2021; 12(2):491-502.
DiGregorio AM, Alvey H. Gastrointestinal Bleeding. [Updated 2023 Jun 5]. In: StatPearls [Internet].
Tell your friends about us.
We would love to help them too.
For First Time Users
What is Ubie’s Doctor’s Note?
We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.
Was this page helpful?
Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.