IBD vs IBS: Symptoms, Tests and Key Differences

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IBD and IBS look similar at first because both may cause belly pain, bloating, diarrhoea or constipation, and changes in bowel habits. IBD involves inflammation and damage in the digestive tract, while IBS does not cause this type of intestinal inflammation. Doctors may use symptoms, medical history and different tests to understand which condition may be causing the problem.

IBD and IBS In Simple Language

IBD

Inflammatory bowel disease (IBD) is a group of conditions, mainly Crohn’s disease and Ulcerative colitis, that cause ongoing inflammation in the digestive tract.

IBS

Irritable bowel syndrome (IBS) is a condition that affects how the gut works and can cause abdominal pain, bloating, and changes in bowel habits without causing inflammation or visible damage to the intestine. 

Side-By-Side Comparison

Symptoms They Can Share

Both IBD and IBS are long-term conditions that directly affect the gut. They share some common symptoms such as:

• Abdominal or belly pain
• Bloating
• Constipation
• Diarrhoea 
• Frequent bowel movements

Features More Suggestive of IBD

Some symptoms are more commonly linked with IBD than IBS; these include:

• Blood in stool
• Unexplained weight loss
• Frequent diarrhoea
• Severe fever
• Loss of appetite
• Severe abdominal pain 
• Rise in inflammatory markers
• Night-time bowel syndrome

Tests Used To Check For Inflammation

Doctors may use blood, stool, and other tests to check for inflammation when IBD is suspected. CRP and ESR are blood tests that show signs of inflammation in the body, while fecal calprotectin checks for inflammation in the intestine through a stool sample. A colonoscopy with biopsy can show inflammation directly and help examine the bowel tissue. Imaging tests such as CT scan and MR enterography may also be used, especially when Crohn’s disease is suspected. 

Normal Tests In IBS 

In IBS, tests are often normal because IBS does not cause visible inflammation or damage to the intestine. Blood tests such as CRP and ESR and stool tests such as fecal calprotectin are usually not raised. If a colonoscopy is done for another reason, it may show no signs of inflammation or damage.

Can A Person Have Both?

Yes, IBD and IBS can occur in the same person. Someone with Crohn’s disease and ulcerative colitis may also have symptoms like IBS, such as bloating, abdominal pain, diarrhoea or constipation, even when IBD is under control. This can make symptoms harder to understand, so doctors look at symptoms, inflammation markers, and test results rather than assuming every symptom is caused by an IBD flare.

When To Book A Medical Assessment

Book a medical assessment if bowel symptoms are persistent, keep coming back, or are affecting daily life. It is especially important to get it checked if you have blood in your stool, unexplained weight loss, ongoing fever, severe abdominal pain, or frequent diarrhoea. Other symptoms include sleep disturbance and unusual tiredness. Seek immediate medical help if you have heavy bleeding, severe belly pain, repeated vomiting, or fainting, because it may lead to severe dehydration and intestinal disorders. 

Urgent Warning Signs

Some symptoms need serious medical care, especially when IBD is already suspected:

Bleeding

Heavy or rectal bleeding caused by a small streak or bleeding in stool can occur with IBD, especially during a flare. Bright red blood may be seen on toilet paper or mixed with stool. It may come with blood clots, dizziness, fainting, or severe weakness. This problem needs serious medical care.

Night Symptoms

Night symptoms such as diarrhoea, abdominal pain, or an urgent need to use the toilet, waking you up in the middle of your sleep and disturbing your sleep at night, can be more suggestive of IBD than IBS and should be discussed with a doctor.

Fever

Fever can occur with IBD due to ongoing inflammation and infection. It can be treated at home, but when it occurs with several symptoms such as abdominal pain, diarrhoea, and other factors, it directly impacts your overall health, and it needs serious medical care. 

Weight Loss

Unexpected weight loss can happen with an active intestinal issue, especially when symptoms affect eating or nutritional absorption. Ongoing weight loss may be a signal of severe malnutrition, and it needs to be checked with a doctor. 

Anaemia

Anemia is more suggestive of IBD than IBS. It may develop because of the ongoing intestinal inflammation or poor nutrient absorption, and can cause tiredness, dizziness, and severe weakness. 

Reference 

Irritable bowel syndrome and inflammatory bowel disease overlap syndrome: pieces of the puzzle are falling into place - PMC

Overlap Between Irritable Bowel Syndrome and Inflammatory Bowel Disease - PMC

Diagnosis of Irritable Bowel Syndrome - NIDDK

Making a positive diagnosis of irritable bowel syndrome - PMC