Narrowing of Stool
Free Symptom Checker
with Physician-supervised AI
Reviewed By:
Aiko Yoshioka, MD (Gastroenterology)
Dr. Yoshioka graduated from the Niigata University School of Medicine. He worked as a gastroenterologist at Saiseikai Niigata Hospital and Niigata University Medical & Dental Hospital before serving as the Deputy Chief of Gastroenterology at Tsubame Rosai Hospital and Nagaoka Red Cross Hospital. Dr. Yoshioka joined Saitama Saiseikai Kawaguchi General Hospital as Chief of Gastroenterology in April 2018.
Please choose the symptom you are most concerned about.
It will help us optimise further questions for you.
By starting the symptom checker, you agree to the Privacy Policy and Terms of Use
Find another symptom
How Ubie can help you
With an easy 3-min questionnaire, Ubie's AI-powered system will generate a free report on possible causes.
Over 1,000 medical centers, trained by over 50 doctors, and still improving.
Questions are customized to your situation and symptoms
Your symptoms
Our AI
Your report
Personalized Report
✔︎ When to see a doctor
✔︎ What causes your symptoms
✔︎ Treatment information etc.
People with these symptoms also use Ubie's symptom checker to find possible causes
Smaller caliber stool
Smaller caliber poo
Just 3 minutes.
Developed by doctors.
Learn More
Content updated on Jan 4, 2023
About the symptom
Decrease in stool caliber describes a condition with thin narrow stools.
When to see a doctor
Seek professional care if you experience any of the following symptoms
Thin narrow stool
Possible causes
- Colon cancer
Cancer of the large intestine. It can be easily treated in the early stage, so the general population is encouraged to get screened with stool blood tests and colonoscopy (camera screening).
- Rectal cancer
Rectal cancer is a type of cancer that starts in the rectum. Malignant, or cancerous cells, form in the rectal tissue and can spread to other parts of the body.
- Sigmoid colon cancer
The sigmoid colon is the final part of the large intestine before reaching the rectum. The exact cause of sigmoid colon cancer is unknown, but it begins when healthy cells in the colon develop changes (mutations) in their DNA. Risk factors include family history, certain hereditary cancer syndromes, diet, smoking, and alcohol use.
- GIST
Questions your doctor may ask about this symptom
Your doctor may ask these questions to check for this symptom
Has your stool become thin and narrow (like a pencil)?
Do you have a fever?
Is there blood in your stool?
Do you have hard stools or constipation recently?
Do you have nausea or vomiting?
Other Related Symptoms
Similar symptoms or complaints
Symptoms from the same body system / part
Symptoms treated by the same specialty
Reviewed By:
Aiko Yoshioka, MD (Gastroenterology)
Dr. Yoshioka graduated from the Niigata University School of Medicine. He worked as a gastroenterologist at Saiseikai Niigata Hospital and Niigata University Medical & Dental Hospital before serving as the Deputy Chief of Gastroenterology at Tsubame Rosai Hospital and Nagaoka Red Cross Hospital. Dr. Yoshioka joined Saitama Saiseikai Kawaguchi General Hospital as Chief of Gastroenterology in April 2018.
User testimonials
Just 3 minutes.
Developed by doctors.
Ubie is supervised by 50+ medical experts worldwide
Seiji Kanazawa, MD, PHD
Obstetrics and gynecology (OBGYN)
National Center for Child Health and Development, Japan