Bowel Issues: Causes of Color Changes and Pain After Gastroenteritis - Gastroenterology and Hepatology

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Bowel issues


Hello doctor, after experiencing gastroenteritis last month, I have been having stomach pain every morning, which eases after bowel movements (I feel a sense of fullness and nausea).
Why is my stool today two colors, yellow and brown? Could this indicate bleeding? Is bleeding stool usually one uniform color? I had a negative fecal occult blood test two months ago.

Wang Daming, 10~19 year old female. Ask Date: 2019/03/16

Dr. Chen Qifeng reply Gastroenterology and Hepatology


This is classified as post-gastroenteritis dysfunction.
There is no evidence of bleeding.

Reply Date: 2019/03/16

More Info


Understanding bowel issues, particularly after experiencing gastroenteritis, can be quite complex. Gastroenteritis, which is an inflammation of the stomach and intestines, often leads to symptoms such as abdominal pain, diarrhea, and changes in bowel habits. It is not uncommon for individuals to experience lingering effects even after the acute phase of the illness has resolved.
In your case, the presence of two different colors in your stool—yellow and brown—can be attributed to several factors. Firstly, the color of stool is influenced by what you eat, the amount of bile present, and how quickly food moves through your digestive tract. Bile, which is produced by the liver and stored in the gallbladder, is responsible for the brown color of normal stool. When food moves too quickly through the intestines, it may not have enough time to be fully processed, resulting in yellow stool. This can occur after gastroenteritis due to the irritation and inflammation of the intestinal lining, which can speed up transit time.

Regarding your concern about potential bleeding, it is important to note that blood in the stool typically presents as a uniform color—either bright red (indicating fresh blood) or dark, tarry black (indicating digested blood). If the stool is mixed with different colors, it is less likely to be due to bleeding. However, if you notice any significant changes in your stool color, especially if it becomes consistently black or red, or if you experience additional symptoms such as severe pain, fever, or vomiting, it is crucial to seek medical attention promptly.

The sensation of abdominal pain that eases after a bowel movement is also noteworthy. This could be a sign of irritable bowel syndrome (IBS), which is a common condition that can develop after gastrointestinal infections. IBS is characterized by abdominal discomfort and changes in bowel habits, including diarrhea and constipation. The feeling of nausea or a "full" sensation after eating can also be associated with this condition.

Since you mentioned that you had a negative occult blood test two months ago, this is reassuring, but it does not completely rule out any gastrointestinal issues. If your symptoms persist or worsen, it would be wise to consult a gastroenterologist for further evaluation. They may recommend additional tests, such as a stool analysis, imaging studies, or even a colonoscopy, depending on your symptoms and medical history.

In summary, while the changes in your stool color and the abdominal pain you are experiencing could be related to the aftermath of gastroenteritis, it is essential to monitor your symptoms closely. If you notice any alarming signs or if your discomfort continues, do not hesitate to seek medical advice. Maintaining a balanced diet, staying hydrated, and managing stress can also help in your recovery process.

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