Is It Normal for Stool to Be Thinner After Taking Probiotics? - Surgery

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Stool has been occasionally thin recently?


Hello, doctor.
I used to have dry bowel movements or go every two days, but since I started taking probiotics a month ago, I can almost have a bowel movement every day.
However, I've noticed that my stools are thinner compared to before, sometimes about the size of my thumb.
There are no other issues like blood in my stool.
Is this normal? Thank you.

xin, 30~39 year old female. Ask Date: 2018/10/04

Dr. Xu Kaixi reply Surgery


Changes in the characteristics of stool should be monitored.
If the stool becomes increasingly narrow, it is advisable to visit a hospital outpatient clinic for further evaluation.

Reply Date: 2018/10/04

More Info


When it comes to changes in stool consistency and frequency after starting probiotics, it's important to understand the role of probiotics in gut health. Probiotics are live microorganisms that can provide health benefits when consumed in adequate amounts. They are often used to improve gut flora, enhance digestion, and alleviate issues such as constipation or diarrhea.

In your case, you mentioned that prior to taking probiotics, you experienced infrequent bowel movements, often every two days, and that your stools were relatively hard. After starting probiotics, you now have daily bowel movements, which is generally considered a positive change, especially if you were previously constipated. The fact that your stools are thinner, resembling the size of your thumb, can be a normal variation, especially if you are experiencing more regular bowel movements.

Several factors can contribute to the change in stool diameter after starting probiotics:
1. Increased Fiber Intake: If your diet has changed alongside the introduction of probiotics—perhaps you are consuming more fiber-rich foods—this can lead to softer, thinner stools. Fiber helps to bulk up stool and can change its consistency.

2. Gut Flora Balance: Probiotics work by altering the composition of gut bacteria. This shift can lead to changes in how food is digested and how waste is formed. A healthier gut flora can result in more efficient digestion, which may lead to thinner stools.

3. Hydration Levels: Increased hydration can also lead to softer stools. If you are drinking more water or consuming more hydrating foods, this could contribute to the change in stool consistency.

4. Normal Variation: Stool size and shape can vary from person to person and can change based on a variety of factors, including diet, hydration, and overall health. Thinner stools can be normal as long as they are not accompanied by other concerning symptoms.

It's crucial to monitor your body for any additional symptoms. If you experience any of the following, it would be wise to consult a healthcare professional:
- Blood in the stool
- Severe abdominal pain
- Persistent diarrhea or constipation
- Unexplained weight loss
In general, if your stools are not accompanied by any alarming symptoms and you feel well overall, the change in stool consistency may simply be a result of the positive effects of probiotics on your digestive system. However, if you have concerns or if the changes persist, it would be advisable to discuss this with your healthcare provider for further evaluation. They may recommend adjusting your probiotic dosage or exploring other dietary changes to ensure optimal gut health.
In summary, while thinner stools can be a normal response to the introduction of probiotics, it's essential to remain vigilant about any accompanying symptoms. Regular check-ins with your healthcare provider can help ensure that your digestive health remains on track.

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