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Here at GLAMOUR, we are here to offer the answers to your most pressing questions. ‘What causes green poo?’ - we've got you. If you're stressing about the colour of your excrement, we aren't here to judge. After all, under normal circumstances, it’s that signature shade of brown, so it can be confusing (and slightly alarming) when it’s suddenly more colourful, which is why we are here to help with all the answers you need.

Thankfully you can breathe a sigh of relief because despite it looking slightly strange, the causes of green poo are usually nothing to worry about, according to Nicole Shen, a board-certified gastroenterologist and hepatologist at SSM Health DePaul Hospital in St. Louis, Missouri.

So, why is your poo green? To quell your curiosity and give you some peace of mind, we asked doctors to explain the most common reasons you might see green before you flush.

First, what’s considered a 'normal' poo colour and consistency?

‘Normal’ is a tricky word, especially when it comes to something like poo, as there is a spectrum of shapes, colours, and consistencies that you can expect to see on a regular basis. A normal poo colour or texture for you may be totally different for someone else – and that applies to how often you poo too.

As we mentioned, the colour is usually a shade of brown, Ashkan Farhadi, M.D., a board-certified gastroenterologist at MemorialCare Orange Coast Medical Center in Fountain Valley, California, explains.

In terms of poop consistency, there’s something called the Bristol Stool Form Scale that illustrates the different types of poo you might produce, ranging from type one (rabbit-style droppings) to type seven (extremely watery diarrhoea). Poo is generally considered normal when it’s within the middle range of this chart (types three and four).

The ‘ideal’ poo texture is often sausage-shaped and relatively firm. “The consistency should be formed and not paste-like,” Dr. Farhadi explains. “It should not dissolve in water or change shape in the water.”

What are the causes of green poo?

There are many potential reasons you could be dealing with green poo. Take a seat – we’ve got a lot to cover.

1. You ate something that contains chlorophyll.

There are plenty of foods that can make your poo Hulk out. A big culprit: green foods like kale, spinach, wheatgrass, and broccoli can make your poop change colour because they contain chlorophyll4, a bright plant pigment that gives green vegetables their vivid hue, Dr. Shen says.

Eating foods that have a lot of green dye in them (think cupcakes with green frosting) can also do the trick, Rudolph Bedford, M.D., a board-certified gastroenterologist at Providence Saint John’s Health Center in Santa Monica, tells SELF.

2. Other foods are affecting your poop’s colour

It’s not only green foods that can lead to green poop. Eating plants that are blue or purple, like blueberries, can do the job too. The reason for that is basically a callback to grade school art classes: when the pigment in these foods mixes with bile, a yellow-green digestive liquid, the resulting poo can look more bright green than you’d expect.

To find out whether your diet is behind your verdant poo, try avoiding your usual green (or blue/purple) foods for several days, Dr. Shen says. If your poo goes back to brown, it’s likely that your food choices are causing your green stool, meaning it’s really nothing to worry about.

3. You may have a bacterial infection

During the digestive process, enzymes chemically change your bile from its usual yellow-green to brown, according to the Mayo Clinic. If your bile can’t break down properly (for reasons we’ll get to in a sec), it will often maintain some of its original yellow-green colour when it leaves your body via your stool.

This can happen if you have an infection from bacteria like salmonella and E. coli, which can cause diarrhoea by forcing your poo to move through your system too quickly. In that case, your bile doesn’t have a chance to become brown, Dr. Shen says. Voilà, now you have green diarrhoea.

4. You could be dealing with a stomach virus

Just like a bacterial infection, a viral stomach infection – like norovirus, which is often contracted through contaminated food or water or touching contaminated surfaces and then touching your mouth – is notorious for causing intense diarrhoea, according to the Centers for Disease Control and Prevention (CDC). When that happens, you can wind up with a rare case of green diarrhoea for the same reason you would with a bacterial infection, along with possible vomiting, stomach pain, and overwhelming nausea.

5. You may have a parasitic infection

Parasites like giardia – which tend to be picked up when you interact with contaminated soil, food, or water – can also lead to some pretty intense diarrhoea about one to two weeks after infection. Because it moves so fast through your body, your poop can then appear green, Dr. Shen says.

If you’re experiencing green diarrhoea along with issues like foul-smelling, greasy poo, stomach cramping, excessive or painful gas, vomiting, dehydration, or fever, it’s a good idea to call your doctor if it doesn’t clear up in a few days, Dr. Bedford says. It could be a sign of a stomach bug that your doctor may be able to speed along with the appropriate treatment.

6. You’re taking certain medications

Today in random things you never thought could affect your poo: certain medicines like the prescription nonsteroidal anti-inflammatory drug indomethacin (often used to treat conditions like rheumatoid arthritis), and the birth control shot Depo-Provera, can cause green poo, according to the Mayo Clinic.

The mechanism behind this isn’t entirely clear, but it’s thought that the drugs might slightly alter the way you digest food, leading to a green pigment showing up in your poo, Dr. Shen says. Several antibiotics can also interfere with your gut flora (i.e., the bacteria in your digestive system), at times causing bile-filled green diarrhoea, according to Brad Kuo, M.D., attending gastroenterologist at Massachusetts General Hospital.

7. You’re taking iron supplements

First thing’s first: you should take iron supplements only if your doctor says they’re necessary due to an issue like iron deficiency anemia. This happens when you lack enough iron for your body to create hemoglobin, a protein that’s essential for healthy red blood cells. If you start taking iron supplements without a doctor’s guidance, you might accidentally ingest too much and wind up with symptoms like nausea and vomiting, so you shouldn’t just decide to take them out of nowhere.

Now that you know that, if you do need to take iron supplements, keep in mind that they can cause green or black poo, Dr. Bedford says. If your poo is black, it actually may be a sign that your body is absorbing the iron properly, according to the U.S. National Library of Medicine. On the other hand, green poo when you’re taking iron supplements may be a sign your body isn’t absorbing the nutrient properly, Dr. Bedford explains, in which case you should talk to a doctor to see whether you need to adjust your formulation or dosage.

8. You have a certain type of irritable bowel syndrome.

Specifically, IBS-D (irritable bowel syndrome that causes diarrhoea) or IBS-M (irritable bowel syndrome that causes a mix of diarrhoea and constipation). You’re probably familiar on some level with irritable bowel syndrome (IBS), a condition that makes life hard by messing with how your large intestine functions. Though experts aren’t sure of the exact cause behind IBS, intestinal contractions are one major factor in this condition, according to the Mayo Clinic.

These contractions help move food through your digestive tract, but if they’re too strong and long-lasting, you might wind up with IBS-D, which stands for irritable bowel syndrome with diarrhoea. If your muscle contractions are too weak, you may deal with IBS-C, which is IBS that causes constipation. If it’s really a toss-up depending on the day, welcome to life with IBS-M, or IBS involving a mix of both constipation and diarrhoea. No matter your kind of IBS, you may also experience abdominal cramping, gas, and mucus in your stool.

If you have IBS-D or IBS-M, you might get diarrhoea and have other symptoms during flare-ups, which can be triggered by stress, foods including wheat, dairy, and citrus, or hormonal changes like being on your period. As with many of the other issues on this list, if IBS is forcing your stool to rush through your body too quickly, you can wind up with green diarrhoea.

If you’ve been diagnosed with IBS-D or IBS-M and you pretty much have things under control, you don’t need to freak out over the occasional green poop. But if you’re regularly having green diarrhoea, and it seems to be linked with things like eating certain foods or feeling overwhelmed with stress, it’s a good idea to check in with your doctor. Together, you may be able to figure out if there’s more you can do to avoid flare-ups.

9. You have Crohn’s disease or ulcerative colitis

Though these inflammatory bowel diseases have various differences, they can both make you more prone to diarrhoea that might look green.

Crohn’s disease causes irritation in your digestive system, usually in your small intestine and the beginning of your large intestine, according to the National Institute of Diabetes and Digestive Kidney Diseases (NIDDK). Diarrhea is a major symptom, and it can be green because of undigested bile, Dr. Shen says. If you have Crohn’s, you might also experience other symptoms like stomach pain, fatigue, fever, weight loss, bloody poo, reduced appetite, and malnutrition, according to the Mayo Clinic.

Ulcerative colitis happens when you have inflammation and sores in your digestive tract, usually in your large intestine and rectum, according to the Mayo Clinic. In addition to diarrhoea, you might experience abdominal cramping, rectal pain, a sensation of really needing to poop, bleeding when you do actually poo, weight loss, fatigue, fever, and other unpleasant symptoms.

Doctors aren’t exactly sure of what causes inflammatory bowel diseases, although it is thought to have an autoimmune component, per the CDC. And, unfortunately, treating these conditions may require some trial and error. If you’re dealing with persistent poo problems, stomach pain, and anything else that seems concerning, see your doctor to see whether you have an inflammatory bowel disease.

10. You’re dealing with a food sensitivity

Food sensitivities, which range from intolerances (triggering a digestive system reaction, such as lactose intolerance) to full-blown allergies (triggering an immune system reaction, such as Celiac disease), can cause some pretty intense symptoms, including diarrhoea, if you’re exposed to the food that triggers a response in your body. Just like having any other health condition that causes diarrhoea, these reactions to food can cause green poo because of undigested bile, Dr. Farhadi says.

11. Your diarrhoea has led to an anal fissure

An anal fissure is as intense as it sounds: It’s a small tear in the thin, moist tissue that lines your anus, according to the Mayo Clinic. This can happen due to constipation, passing hard or oversized poo, chronic diarrhoea, anal sex, or giving birth.

Anal fissures themselves don’t cause green poo – if anything, you may notice a bit of red due to bleeding from the tear. But if you have an anal fissure due to chronic diarrhoea, you might notice some green poo in the mix. Thankfully, eating more fibre (so your stool is easier to pass) or taking a bath to calm inflammation is often enough to help you feel better with time.

12. You recently had your gallbladder removed

Now, for the last stop on the bile train: Removal of your gallbladder, which stores bile, can result in green poo. This pear-shaped organ might need to be removed if you have gallstones, which are hard deposits of material that can block the flow of bile and cause a world of hurt. Also known as a cholecystectomy, this is one of the most common surgeries in the United States, per the NIDDK.

Once your gallbladder is gone, your body no longer has a place to store bile. As a result, you might have some diarrhoea that includes more bile than usual, causing your poop to have a green colour, Dr. Bedford says. If you’re dealing with this symptom and you recently had your gallbladder removed, you shouldn’t stress over it – the diarrhoea typically goes away within eight weeks as your body adjusts. If it doesn’t, or if you’re concerned, bring it up with your doctor.

What should you do if your poo is green? Here’s when it’s time to see a doctor

Green poo can be completely normal, but it can also be a sign that you’re dealing with an underlying issue that may not resolve on its own. So if you’re pooping green and can’t figure out what’s going on, don’t feel embarrassed to check with your doctor, Dr. Bedford says. Seriously –they’re so used to this stuff!

That said, as a reminder, you should seek medical attention if you’re experiencing any of the following symptoms alongside your green poo, as they can be indicative of some of the health issues we covered above that require treatment:

• Abdominal pain or cramping
• Blood in stool
• Fatigue
• Weight loss
• Vomiting
• Fever

Beyond that, the key factor is whether or not your green poo is persistent, Dr. Shen says. If it pops up only after you inhale a massive salad followed by a green juice, you’ve probably found your culprit. If you can’t track it that easily and it’s sticking around, there’s a chance something might be up with your health, Dr. Bedford says. It’s worth checking in with a medical professional just to be safe.

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