How are incomplete bowel movements and bloating related?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Incomplete bowel emptying is a common cause of bloating. When stool isn't fully passed, it can ferment in the colon, producing excess gas that stretches the abdomen and creates that uncomfortable, swollen feeling in the belly.

Bloating tied to incomplete evacuation may signal issues like constipation, IBS, pelvic floor dysfunction, or dietary triggers—each requiring a different approach. Because the underlying cause shapes the right treatment, guessing can delay relief. A free, instant, online symptom check can help you identify likely causes based on your specific symptoms and guide you toward the next best step, whether that's a lifestyle adjustment or seeing a doctor.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

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Explanation

When someone feels like they haven't finished a bowel movement, it may mean that stool is staying in the colon longer than it should. This lingering stool can allow bacteria to work on the waste, which can produce extra gas. This extra gas builds up and makes the belly feel swollen or bloated.

Research has shown that when it takes longer for a balloon (used in a test) to be pushed out, there is a link with more abdominal distension, meaning the belly looks or feels larger. In conditions like constipation and irritable bowel syndrome, people often worry that they haven't fully emptied their bowels. This feeling of incomplete bowel movements can go hand in hand with bloating because both may be signs of slower movement of material through the gut.

If this process happens, it can lead to discomfort for many individuals. If you're experiencing these symptoms, try our free AI symptom checker to better understand what might be causing your discomfort. Understanding this connection helps doctors look at both symptoms together and consider treatments that help move things along in the digestive system, easing both incomplete bowel movements and bloating.

(References)

Shim L, Prott G, Hansen RD, Simmons LE, Kellow JE, Malcolm A. Prolonged balloon expulsion is predictive of abdominal distension in bloating. Am J Gastroenterol. 2010 Apr;105(4):883-7. doi: 10.1038/ajg.2010.54. Epub 2010 Feb 23. PMID: 20179695.
Heidelbaugh J, Martinez de Andino N, Pineles D, Poppers DM. Diagnosing Constipation Spectrum Disorders in a Primary Care Setting. J Clin Med. 2021 Mar 5;10(5):1092. doi: 10.3390/jcm10051092. PMID: 33807888; PMCID: PMC7961346.
Enck P, Aziz Q, Barbara G, Farmer AD, Fukudo S, Mayer EA, Niesler B, Quigley EM, Rajilić-Stojanović M, Schemann M, Schwille-Kiuntke J, Simren M, Zipfel S, Spiller RC. Irritable bowel syndrome. Nat Rev Dis Primers. 2016 Mar 24;2:16014. doi: 10.1038/nrdp.2016.14. PMID: 27159638; PMCID: PMC5001845.

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