Changes in Stool: When to Seek Medical Attention

Bowel issue: stool suddenly becomes thin?

Hello, doctor: About three days ago, I had an upset stomach, and my stool was loose.
By the previous day, my stool had returned to a normal banana shape.
However, after breakfast today, I felt a bit uncomfortable in my stomach, and when I had a bowel movement, I noticed that my stool had become very thin.
I previously researched that thin stools can be a warning sign.
Should I seek medical attention for an examination?

Xiao Shen, 20~29 year old female. Ask Date: 2020/03/24

Dr. Ke Fangxu reply Surgery

The warning sign of thinner stools is indicative of rectal cancer causing intestinal obstruction, which is already a late-stage symptom.
In younger individuals, this phenomenon is mostly caused by swollen hemorrhoids.
If diarrhea improves and normal stool consistency returns, there is generally no cause for concern.
However, if the symptoms persist without improvement, it is advisable to consult a physician for medication or to undergo a colonoscopy.

Reply Date: 2020/03/24

More Info

When it comes to changes in stool, particularly when you notice a significant alteration in its consistency or shape, it is essential to pay attention to these changes as they can sometimes indicate underlying health issues. In your case, you mentioned that your stool has changed from being loose to a more normal consistency and then to a very thin shape. This progression can understandably cause concern.

Firstly, it’s important to recognize that stool consistency and shape can be influenced by various factors, including diet, hydration, and gastrointestinal health. After experiencing diarrhea, it is not uncommon for the stool to return to a more normal state, but any persistent changes should be monitored closely. The fact that you experienced a return to a more typical "banana-shaped" stool is a positive sign, but the subsequent change to very thin stools warrants further investigation.

Thin or pencil-like stools can sometimes be a sign of a narrowing of the intestinal passage, which could be due to several reasons, including but not limited to:
1. Irritable Bowel Syndrome (IBS): This functional gastrointestinal disorder can lead to changes in bowel habits, including the shape and consistency of stools.

2. Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease or ulcerative colitis can cause inflammation in the intestines, leading to changes in stool.

3. Colon Polyps or Tumors: Although less common, a significant change in stool shape can sometimes indicate the presence of polyps or tumors in the colon, which can obstruct the passage of stool.

4. Dietary Factors: A diet low in fiber or high in processed foods can also lead to changes in stool shape and consistency.

Given your symptoms, it is advisable to seek medical attention, especially since you have noted a change in the shape of your stool. A healthcare provider can perform a thorough evaluation, which may include a physical examination, a review of your medical history, and possibly diagnostic tests such as stool tests, blood tests, or imaging studies to rule out any serious conditions.

In the meantime, consider keeping a record of your symptoms, including any dietary changes, bowel habits, and any other symptoms you may be experiencing (such as abdominal pain, bloating, or changes in appetite). This information can be very helpful for your healthcare provider in determining the cause of your symptoms.

In conclusion, while some changes in stool can be benign and related to diet or temporary gastrointestinal disturbances, persistent changes, especially those involving the shape of the stool, should not be ignored. It is always better to err on the side of caution and consult with a healthcare professional to ensure that any potential issues are addressed promptly.

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