Why Does My Poop Smell Like Metal? Science Explanation

Why Does My Poop Smell Like Metal? Science Explanation

Talking about poop can be uncomfortable for people. However, because of this, many are in the dark about stool health and how this can reflect your entire body’s condition(s).

People scour the internet to learn about the science behind their poop and why it smells, looks, or behaves the way it does. A popular question under this topic is why poop can smell like metal—a curious case indeed for people who experience it.

Why Does My Poop Smell Like Metal?

Diet Practices

The first thing you should consider when asking “Why does my poop smell like metal?” is what you have been eating. Often, one’s diet affects what their stool looks and smells like.

Think about your food intake: are they high in sulfurous food such as meats, dairy, garlic, and broccoli? If yes, then this may be a reason why your poop smells like metal. This goes especially to people who have no other symptoms.

Foul-smelling poop is also common for people undertaking fad diets such as Paleo (food eaten during the hunter/gatherer period) and Keto (high fat, low carb). These can be the causes behind poop smelling like metal. The reason behind this lies in your body adjusting to the dietary changes you are making.

Additionally, those who suffer from lactose intolerance may notice that their poop smells putrid or metal. The solution is easy: avoid dairy or take medicine prescribed by your doctor.

Vitamin and Drug Intake

Diet practices bridge over to the medicine you take. People who take diet pills or vitamin supplements more often than not report their stool smelling unusually metallic.

This happens because these pills are often covered in preservatives and colored dyes. Once ingested, these can change not only the way your poop smells, but also when it occurs and how it looks.

Vitamin B supplements are known to cause poop that smells putrid and metallic too. Antibiotics can also affect the body the same way.

If you’re taking pills detailed above, then you do not have to worry much about your stool smelling like metal. This is a normal side effect, and as long as you are not experiencing other bodily pains—you’re good.


Your poop can also smell like metal because of an infection. Beyond this metallic smell, other symptoms of a bodily infection occurring are abdominal pain and cramping, diarrhea, fever, and loss of appetite.

Food poisoning is a common culprit in infections like these, but other gastrointestinal infections can also be behind the sudden change in smell. Either way, these are caused by bacteria, viruses, and/or parasites in your body.

To avoid this from happening to you again, be wary about the quality of your food, especially with uncooked meats and eggs. Washing your hands and being clean in your kitchen are also one of the many ways to prevent food poisoning.


When getting a general check-up, stool samples are often requested of people. This is not to make patients uncomfortable—poop can determine if you have an underlying illness or not.

Should your pool smell like metal while you experience mouth sore, bodily pains, and bloody diarrhea, contact your local health professionals immediately. Foul-smelling stool can be a symptom of diseases such as inflammatory bowel diseases and even cancer.

Self-explanatory, inflammatory bowel diseases are the inflammation of your digestive tract. Examples of these are Crohn’s disease and ulcerative colitis. Lifestyle, genetics, and environmental factors can cause you to have them.

Metal-smelling stools, coupled with a dark and bloody color, can also be a sign of colorectal cancer. This type of cancer often begins in one’s digestive tract.

Should I worry about smelling like metal?

A metallic smell anywhere in your body can be worrisome because these are not “natural” smells we are used to. For the most part, a metallic smell caused by your body is fine. According to a study in 2006, this smell is a type of body order one can get from working with a lot of metal.

Moreover, metal is a “natural” smell—human beings have iron and other minerals coursing through their bloodstreams.

Final Word

Listen to your body and do not be scared to learn what it’s made out of. Stools smelling like metal, with no other symptoms, is usually no cause for concern.