You've probably had a stretch where your gut just didn't feel right. For a lot of people, a doctor eventually lands on IBS, and that becomes the working answer. But some symptoms don't quite fit that label.
Crohn's disease and irritable bowel syndrome share the obvious complaints. Diarrhea, cramping, bloating. The difference is damage.
According to the NIH's MedlinePlus, "IBS can cause a great deal of discomfort" but "does not harm the intestines." Crohn's does.
That is why gastroenterologists treat a short list of symptoms as red flags. They can look like IBS, but they are not features of IBS. The Mayo Clinic names weight loss, nighttime diarrhea, rectal bleeding and iron deficiency anemia among the signs that point beyond IBS.
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Blood in the stool or rectal bleeding
Blood on the paper, in the bowl or mixed into the stool is not a normal part of IBS. Mayo Clinic lists blood in the stool among the common symptoms of inflammatory bowel disease. If it does not go away, see a doctor promptly.
Weight loss you did not try for
Unintended weight loss is not an IBS feature. Mayo Clinic names it as a reason to see a doctor, and both Mayo and the NIH's NIDDK list it among the common symptoms of Crohn's disease.
Fever
IBS does not cause fever. The NIDDK lists fever among the typical symptoms of Crohn's, alongside anemia, feeling tired, mouth sores and joint pain.
Diarrhea that wakes you at night
IBS tends to go quiet while you sleep. Diarrhea that pulls you out of bed is on Mayo Clinic's alarm list and is a classic sign of inflammatory bowel disease.
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Iron deficiency anemia
Low iron with no clear explanation can point to slow bleeding somewhere in the gut. Anemia appears on both Mayo Clinic's IBS alarm list and NIDDK's list of common Crohn's symptoms.
Mouth sores
Crohn's can inflame anywhere in the digestive tract, including the mouth. NIDDK lists mouth sores among the possible symptoms. IBS does not cause them.
Pain or drainage near the anus
Crohn's often causes problems around the anus. Fissures, abscesses and fistulas are listed by NIH's MedlinePlus among the complications of Crohn's. These are small tunnels running from the bowel to the skin or another organ. They are not part of IBS.
Fatigue that does not lift with rest
A heavy tiredness that stays even after a full night's sleep can signal ongoing inflammation or anemia. NIDDK includes feeling tired on its Crohn's symptom list, while IBS fatigue is usually tied to active symptom flares rather than steady exhaustion.
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When to push for a referral
Mayo Clinic names clear reasons to seek care. Diarrhea that does not stop, blood in the stool that does not go away, severe abdominal pain, a fever, or weight loss without trying.
Any of these on top of an existing IBS label is a reason to ask your doctor about a gastroenterology referral to rule out inflammatory bowel disease. Watchful waiting is not the right move here.
Crohn's that affects most of the colon also raises the long-term risk of colon cancer. Mayo Clinic recommends colonoscopy screening start about 8 to 10 years after an IBD diagnosis, repeating every 1 to 5 years depending on the findings.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.