Post-Colonoscopy Diarrhea: Is It Normal After Two Weeks? - Surgery

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Diarrhea after undergoing a colonoscopy?


Hello, doctor.
My mother (60 years old) had a colonoscopy two weeks ago, and the results were healthy.
She usually has regular and normal bowel movements, but since the colonoscopy, she has been experiencing intermittent diarrhea for the past two weeks.
Is this normal? Thank you.

Li, 60~69 year old female. Ask Date: 2020/09/28

Dr. Ke Fangxu reply Surgery


After undergoing a colonoscopy, some patients may experience this phenomenon, which is likely related to bowel preparation.
If the bowel cleansing is thorough, it can lead to the depletion of gut probiotics.
Younger individuals tend to rebuild their probiotic flora more quickly, while older adults can expedite this process by consuming yogurt or probiotic-rich foods.
Taking commercially available probiotic supplements is also an option, but it is important to choose reputable brands.
Gradually, this will lead to improvement.

Reply Date: 2020/09/28

More Info


Post-colonoscopy diarrhea can be concerning, especially if it persists for two weeks after the procedure. While some gastrointestinal disturbances can occur following a colonoscopy, it is essential to understand the underlying reasons and when to seek further medical advice.

Firstly, it is not uncommon for patients to experience changes in bowel habits after a colonoscopy. The procedure itself can cause temporary irritation to the intestinal lining, especially if biopsies were taken or polyps were removed. This irritation can lead to symptoms such as diarrhea, increased frequency of bowel movements, or even mild abdominal discomfort. However, these symptoms typically resolve within a few days to a week after the procedure.

In your mother's case, experiencing diarrhea for two weeks post-colonoscopy is longer than what is generally expected. While it may not be unusual for some individuals, it is essential to consider other factors that could be contributing to her symptoms. Here are some potential reasons for prolonged diarrhea after a colonoscopy:
1. Dietary Changes: After a colonoscopy, patients are often advised to follow a specific diet. If your mother has altered her diet significantly post-procedure, this could lead to gastrointestinal upset. For instance, reintroducing high-fiber foods too quickly or consuming dairy products after a period of restriction can cause diarrhea.

2. Medication Effects: If your mother was prescribed medications post-colonoscopy, such as antibiotics or laxatives, these could also contribute to diarrhea. Antibiotics can disrupt the normal gut flora, leading to antibiotic-associated diarrhea.

3. Underlying Conditions: Sometimes, the procedure may unmask or exacerbate underlying gastrointestinal conditions, such as irritable bowel syndrome (IBS) or inflammatory bowel disease (IBD). If your mother has a history of such conditions, they may be contributing to her current symptoms.

4. Infection: Although rare, infections can occur after a colonoscopy, especially if there was any breach in the mucosal barrier during the procedure. Symptoms of infection may include persistent diarrhea, fever, or abdominal pain.

Given that your mother has been experiencing diarrhea for two weeks, it is advisable to consult her healthcare provider. They can perform a thorough evaluation, which may include a physical examination, stool tests, or other diagnostic procedures to rule out infections or other gastrointestinal issues.
In the meantime, here are some general recommendations for managing diarrhea:
- Stay Hydrated: Ensure your mother drinks plenty of fluids to prevent dehydration, which can occur with diarrhea. Oral rehydration solutions can be beneficial.

- Dietary Adjustments: A bland diet, such as the BRAT diet (bananas, rice, applesauce, toast), may help ease symptoms. Gradually reintroducing other foods can help identify any triggers.

- Monitor Symptoms: Keep track of any additional symptoms, such as fever, blood in the stool, or severe abdominal pain, and report these to her doctor.

In conclusion, while some gastrointestinal disturbances can occur after a colonoscopy, persistent diarrhea for two weeks warrants further investigation. It is essential to consult with her healthcare provider to determine the cause and appropriate management. Early intervention can help alleviate symptoms and address any underlying issues effectively.

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