Loose Stools: Food Residue or Blood? - Gastroenterology and Hepatology

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Bowel-related issues?


Hello doctor, I am 26 years old.
Recently, my stools have been looser, and I often notice food remnants such as black glutinous rice, sesame seeds, and chili skins.
Today, I found a red piece in the middle of my stool.
When I dabbed it with toilet paper and lightly rubbed it with chopsticks, I noticed red marks on the paper.
There was also a layer of something that I couldn't identify, which could be rolled into small balls.
Three hours later, when I checked the toilet paper again, the red marks were still bright red, and the substance that resembled skin was dry and hard, like paper scraps, also red.
Yesterday, the only red foods I consumed were carrots, half a cherry tomato, and a small piece of red bell pepper.
Could you please tell me if the red substance is food residue or blood?

Niming, 20~29 year old female. Ask Date: 2023/02/20

Dr. Chen Shidian reply Gastroenterology and Hepatology


It should not be a blood clot; further observation is needed.

Reply Date: 2023/02/20

More Info


When it comes to understanding the nature of your stools, especially when you notice changes such as loose consistency or the presence of food residue and blood, it is essential to consider various factors, including your diet, digestion, and overall gastrointestinal health.

Firstly, the presence of food residues such as black glutinous rice, sesame seeds, and chili skins in your stools is not uncommon. These foods contain fibrous components that may not be fully digested, leading to their appearance in your stool. The human digestive system is capable of breaking down many foods, but some fibrous materials, particularly those high in insoluble fiber, can pass through the digestive tract relatively intact. This is especially true for foods like sesame seeds and chili skins, which are known for their tough outer layers.

Regarding the red substance you observed, it is crucial to differentiate between food residue and actual blood. The fact that you consumed red foods such as carrots, cherry tomatoes, and red bell peppers the day before could explain the presence of red coloration in your stool. Carrots, for instance, contain carotenoids, which can sometimes impart a reddish hue. However, the bright red color you described, especially if it remains on the tissue after wiping, raises a concern for potential bleeding in the gastrointestinal tract.

In medical practice, the presence of bright red blood in the stool can indicate several conditions, ranging from benign to more serious issues. Bright red blood typically suggests that the source of bleeding is closer to the rectum or anus, such as hemorrhoids or anal fissures. However, if the blood is mixed with the stool or appears as a darker coloration, it may indicate bleeding from higher up in the gastrointestinal tract, such as the colon or even the stomach.

Given your symptoms, it is advisable to monitor your condition closely. If the red coloration persists, or if you experience additional symptoms such as abdominal pain, changes in bowel habits, or any signs of anemia (like fatigue or pallor), you should seek medical attention promptly. A healthcare provider may recommend diagnostic tests, such as a stool test, colonoscopy, or imaging studies, to determine the underlying cause of the bleeding.

In the meantime, maintaining a balanced diet that includes adequate fiber can help regulate your bowel movements. However, if you are experiencing loose stools consistently, it may be beneficial to assess your diet for any potential irritants or allergens. Foods that are high in fat, spicy, or overly processed can sometimes exacerbate gastrointestinal symptoms.

In conclusion, while the presence of food residues in your stool can be normal, the bright red coloration you observed warrants further investigation to rule out any serious conditions. It is always better to err on the side of caution when it comes to gastrointestinal health, so do not hesitate to consult with a healthcare professional for a thorough evaluation.

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