No, diarrhea doesn't completely "clean" your colon; it's your body's forceful way to flush out irritants like bacteria or toxins, but it's also a sign of imbalance, leading to fluid loss and disrupting healthy gut bacteria, not a true cleanse. While it removes some waste quickly, the colon constantly produces new stool, so it's never truly empty, and diarrhea can harm your gut health by washing away good microbes, say experts at Verywell Health, say experts at WebMD, and say experts at Cary Gastroenterology Associates.
Just like a fever that “burns off” invaders, diarrhea can be a way for the body to quickly flush the colon of unwanted toxins, bacteria, or waste. In essence, the body holds onto solid waste temporarily, while liquid waste is flushed out to clean up the digestive system.
In this context, diarrhea may be part of the body's effort to rid the digestive tract of potentially harmful bacteria or other substances. This may also explain why diarrhea appears to be a response to certain foods that can irritate the intestinal lining and cause inflammation.
If I am already having diarrhea, do I still have to drink all of the prep? Yes, you must drink ALL of the prep as directed. Your colon is about 5 feet long. The entire colon must be emptied by drinking the prescribed prep solution in order for your Gastroenterologist to be able to perform a high quality colonoscopy.
Digestive system changes, including nausea, vomiting, and diarrhea, are common during detox as the body begins to eliminate toxins. These symptoms result from the body repairing the stomach and intestines while expelling harmful substances. Increased bowel movements and frequent diarrhea expedite toxin removal.
As your body readjusts to a new normal, all of your systems can experience symptoms, including your digestive system. Nausea, vomiting and diarrhea are all common symptoms of alcohol and drug detox as your body tries to regulate what you're now putting into your system versus what you have in the past.
Diarrhea is defined by loose, often watery bowel movements. This can happen when toxins or infectious organisms find their way into your digestive system. The immune system's natural response is to fight back, attacking the rogue invaders and flushing them out.
How can you tell if your colon is clean and ready for a colonoscopy? Your stool after finishing your bowel prep agent can act as a guide. Your stool should be clear, yellow, light and liquid. The presence of dark particles or thick brown or black stool means you are not ready for colonoscopy.
Long-term (chronic).
Diarrhea that lasts several weeks. This may be caused by another health problem such as irritable bowel syndrome. It can also be caused by an intestinal disease such as Crohn's disease or celiac disease. Some infections such as parasites can cause chronic diarrhea.
Preparing for a colonoscopy requires clearing the bowel with fasting, a laxative drink and, in some cases, and enema. While such preparation can alter the microbiome, the rich array of microbes that are present in the gut, research suggests that the microbiome bounces back in about two to four weeks.
When the cells in your small intestine or colon are irritated, the relaxed and regular movement of your intestines can become overactive. Essential salts and fluids, as well as nutrients from the food that you eat, end up being passed through the colon too quickly.
The amount of stool or poop in your colon varies depending on factors such as diet, hydration, and frequency of bowel movements. The intestines can hold as little as 5 pounds and as much as 25 pounds of waste at any given time, varying greatly depending on body weight and diet.
They determined that diarrhea served the useful function of clearing out the digestive tract of the harmful pathogen, which also limited the severity of the infection.
Studies at Brigham and Women's Hospital have determined that diarrhea plays a crucial role in clearing the bacteria that is found in the intestines at the beginning of an infection.
Toxic Megacolon
The warning signs
So how do you know whether it's time to take better care of your gut health? In most cases, you'll be clued in by gastrointestinal symptoms: acid reflux, belching, bloating, abdominal pain, or irregular bowel movements.
Diarrhea is a common symptom of conditions that cause irritation and inflammation in your bowels (intestines). Crohn's disease, ulcerative colitis and irritable bowel syndrome (IBS) can all cause diarrhea. Stress and anxiety can worsen symptoms if you have a condition like IBS.
Organ failure, primarily kidney failure (renal failure), is a major cause of diarrhea, stemming from toxin buildup and inflammation in the gut, but liver or intestinal issues (like inflammatory bowel disease or infections, often secondary to weakened immunity in kidney failure) can also cause it, with severe diarrhea worsening kidney function due to dehydration and electrolyte imbalance.
Symptoms
How do you know if your colon is not healthy? Watch out for persistently very loose or watery stools, dry or difficult-to-pass stools, or blood in the stool or with bowel movements.
Signs Your Colon is Clear
The morning of your exam if you are still passing brown liquid with solid material mixed in, your colon may not be ready and you should contact your doctor's office. Passing mostly clear or only a light color, including yellow, is a sign your colon is clean enough for an accurate examination.
There are several types of solutions or pills you can use to clear the colon. Depending on which method your healthcare provider prescribes, you may start having bowel movements within an hour of your first dose. 1 It can then take about 14 hours to complete the process.
Diarrhea lasting more than two days in adults or 24 hours in young children warrants a doctor's visit, especially with signs of dehydration (excessive thirst, little urination), fever (over 102°F/39°C), severe pain, or bloody/black stools. Diarrhea exceeding four weeks is considered chronic and always needs medical investigation, as it signals an underlying issue like IBS, IBD, infections, or food intolerances.
Most of the time, diarrhea is simply your gut's way of getting rid of a harmful invader, like a bacteria or virus. However, in some cases, diarrhea is caused by a malfunction of the gut, as is the case with inflammatory bowel disease. Many viruses can cause diarrhea.