Blood in Stool: Causes and Concerns for Soft Bowel Movements - Internal Medicine

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Blood in the stool?


Hello, doctor.
I exercise regularly and have daily bowel movements.
However, two days ago, I noticed that my stool was soft and yellow, and there were some streaks of blood on the surface.
I would like to know what this could indicate, as I have never experienced this before, and I am concerned about the presence of blood in my soft stool.
What could be the issue?

Ming, 10~19 year old female. Ask Date: 2021/03/20

Dr. Lin Wufu reply Internal Medicine


Hello: If blood streaks are discovered incidentally, it may be due to internal hemorrhoid bleeding or a rupture of the mucosa in the colon, and there is generally no need for excessive concern.
However, if it occurs repeatedly, it is advisable to consult a gastroenterologist for further examination.

Reply Date: 2021/03/20

More Info


When you notice blood in your stool, especially when accompanied by soft bowel movements, it can understandably be a cause for concern. There are several potential reasons for this occurrence, and it's important to consider both the nature of the blood and any accompanying symptoms.

Firstly, the presence of blood in the stool can often be attributed to benign conditions such as hemorrhoids or anal fissures. Hemorrhoids are swollen veins in the lower rectum or anus that can bleed during bowel movements, particularly if the stool is soft or if there has been straining. Anal fissures, which are small tears in the lining of the anus, can also cause bright red blood on the surface of the stool or on toilet paper after wiping. Both conditions can lead to discomfort and may cause a burning sensation during or after bowel movements.

In your case, since you mentioned that the stool was soft and yellow, it is less likely that the blood is coming from higher up in the gastrointestinal tract, such as the stomach or small intestine, where the blood would typically appear darker due to digestion. Instead, the bright red blood suggests that the source is likely lower in the digestive tract, such as the rectum or anus.

Another possibility is that your soft stools may be a result of dietary choices or gastrointestinal issues. For example, consuming a diet high in fiber can lead to softer stools, which is generally beneficial for bowel health. However, if there are sudden changes in your diet or if you are experiencing gastrointestinal distress, this could also lead to changes in bowel habits and the appearance of blood.

While the presence of blood in the stool can often be benign, it is essential to monitor the situation closely. If the bleeding persists, increases in volume, or is accompanied by other symptoms such as abdominal pain, changes in bowel habits, weight loss, or fatigue, it would be prudent to seek medical attention. A healthcare provider may recommend further evaluation, which could include a physical examination and possibly a colonoscopy to rule out more serious conditions such as inflammatory bowel disease (IBD) or colorectal cancer, especially if you have a family history of such conditions.

In summary, while the presence of blood in soft stools can often be attributed to benign causes like hemorrhoids or anal fissures, it is essential to remain vigilant. If you notice any changes in your symptoms or if the bleeding continues, do not hesitate to consult a healthcare professional for a thorough evaluation. Maintaining a balanced diet, staying hydrated, and ensuring regular bowel habits can also help promote overall gastrointestinal health.

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