Digestive symptoms can be very common, with many people experiencing bloating, abdominal pain and bowel changes such as diarrhoea and/or constipation, at some point in their life. When these symptoms are persistent, people may assume they have Irritable Bowel Syndrome (IBS). IBS is one of the most common gastrointestinal disorders, but it is not the only condition that can cause these symptoms.In reality, there are several medical conditions that share many of the same features as IBS. Some can be manageable with dietary changes, while others require medical treatment and should not be overlooked. This is why it’s important not to self-diagnose based solely on symptoms you’ve read about online.Receiving the correct diagnosis is the first step towards effective treatment. A registered dietitian can help identify symptom patterns, assess your diet and lifestyle, recognise when symptoms suggest something more serious, whilst you work alongside your GP or specialist to ensure you receive appropriate care and diagnosis.If you’re struggling with ongoing digestive symptoms, our IBS specialist dietitians can help you understand what’s happening and develop an evidence-based plan tailored specifically to you.
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Could Your Symptoms Be Something Other Than IBS?
IBS is a functional gastrointestinal disorder, meaning the digestive tract appears structurally normal but doesn’t function as it should do. The most common symptoms include:
- Abdominal pain
- Excessive bloating
- Excessive wind
- Diarrhoea, constipation, or both
- Urgency to open bowels
- Feeling of incomplete bowel emptying
These symptoms can fluctuate over time and are influenced not only by diet, but also stress, hormones, sleep and other lifestyle factors. The challenge is that these symptoms are not unique to IBS.Conditions including coeliac disease, inflammatory bowel disease (IBD), food intolerances, small intestinal bacterial overgrowth (SIBO), and endometriosis can all present in a very similar way.Because of this overlap, healthcare professionals are unable to diagnose IBS simply because someone has bloating or abdominal pain. Instead, they consider your full medical history, symptom pattern, family history, blood tests, stool tests, and whether any “red flag” symptoms are present.Seeking professional advice is particularly important if you have:
- Unexplained weight loss
- Blood in your stool
- Persistent diarrhoea
- Anaemia
- A family history of bowel cancer, inflammatory bowel disease or coeliac disease
- Symptoms beginning later in life
- Persistent severe abdominal pain
- Ongoing vomiting
These symptoms don’t necessarily mean something serious is wrong, but they do require medical assessment before IBS can be confidently diagnosed.
Five Conditions Commonly Mistaken for IBS
Many digestive conditions share similar symptoms with IBS. Understanding the differences can help you receive the correct diagnosis sooner.
Coeliac Disease
Coeliac disease is an autoimmune condition where the immune system reacts abnormally to gluten, the protein found in wheat, which can lead to damage of the lining of the small intestine.Symptoms can include:
- Diarrhoea
- Constipation
- Bloating
- Abdominal pain
- Fatigue
- Iron deficiency anaemia
- Unexplained weight loss
- Nutrient deficiencies
Because these symptoms closely resemble IBS, many people mistakenly believe gluten is simply a trigger for their IBS when they may actually have untreated coeliac disease.One of the biggest mistakes people make is removing gluten before being tested. Blood tests for coeliac disease rely on you regularly consuming gluten containing foods. If these gluten containing foods have already been removed from the diet, the test can produce a false negative result, making diagnosis much more difficult. If coeliac disease is suspected, speak to your GP before making dietary changes.Once diagnosed, lifelong strict avoidance of gluten is essential. Working with a dietitian helps ensure the diet remains nutritionally balanced while preventing accidental gluten exposure.
Inflammatory Bowel Disease (Crohn’s Disease and Ulcerative Colitis)
Inflammatory bowel disease (IBD) includes Crohn’s disease and ulcerative colitis.Unlike IBS, these are inflammatory autoimmune conditions that cause physical damage within the digestive tract.Symptoms may overlap with IBS but often include:
- Persistent diarrhoea
- Blood in the stool
- Urgency
- Abdominal pain
- Fatigue
- Weight loss
- Reduced appetite
- Fever
- Anaemia
Many people initially assume they have IBS because of abdominal pain and diarrhoea, delaying appropriate assessment.Red flag symptoms that should never be ignored include:
- Rectal bleeding
- Unexplained weight loss
- Frequent night-time bowel movements
- Persistent severe pain
- Fever
- Ongoing fatigue with anaemia
These symptoms require prompt assessment by your GP and can lead to further investigations such as stool tests, blood tests or a colonoscopy. Early diagnosis allows treatment to begin sooner and helps reduce the risk of long-term complications. If digestive symptoms are accompanied by unexplained weight loss or other concerning features, it’s also important to rule out more serious conditions before assuming IBS.
Food Intolerances
Food intolerances are another common cause of digestive symptoms and are frequently confused with IBS.Unlike food allergies, food intolerances do not involve the immune system. Instead, symptoms occur because certain foods are poorly digested or absorbed.Common examples include:
- Lactose intolerance
- Fructose malabsorption
- Polyol intolerance (sugar alcohols, such as sorbitol or xylitol)
- Excess intake of other fermentable carbohydrates (other types of FODMAP’s)
Symptoms often include:
- Bloating
- Wind
- Abdominal discomfort
- Diarrhoea
- Noisy bowel sounds
Many people respond by removing multiple foods from their diet without guidance, but this often creates more problems than it solves. These self-inflicted restrictive diets can increase nutritional deficiencies, create unnecessary anxiety around food and make it harder to identify the true triggers.A structured dietary assessment will allow a dietitian to:
- Review symptom patterns
- Assess overall nutritional intake
- Identify likely food triggers
- Decide whether dietary changes are appropriate
- Prevent unnecessary dietary restrictions
For many people with IBS, certain FODMAP-containing foods worsen symptoms, but this does not necessarily mean they have a food intolerance. The relationship between food and symptoms is often far more complex.
Small Intestinal Bacterial Overgrowth (SIBO)
Small Intestinal Bacterial Overgrowth (SIBO) occurs when excessive bacteria grow within the small intestine.These bacteria ferment carbohydrates earlier than they should, producing gas and digestive symptoms.Common symptoms include:
- Bloating
- Excessive gas
- Abdominal discomfort
- Diarrhoea
- Constipation
- Feeling full quickly
These symptoms closely resemble IBS, particularly IBS with bloating.Research has shown that some people diagnosed with IBS
can also have SIBO, although the relationship between the two conditions remains an area of ongoing research.SIBO is more likely in people with:
- Diabetes, as this can impact gut motility
- Certain autoimmune conditions such as coeliac disease
- Structural abnormalities of the digestive tract
- Conditions affecting intestinal movement (including IBS)
- Hypothyroidism, as low thyroid can influence intestinal transit
Diagnosis usually involves specialist breath testing alongside assessment of symptoms and medical history. Treatment may include antibiotics, dietary modifications and management of the underlying cause.Because symptoms overlap significantly, it’s important not to assume SIBO is present simply because bloating occurs after meals. A thorough assessment helps determine whether further investigation is appropriate.
Endometriosis
Although endometriosis is primarily considered a gynaecological condition, it commonly causes digestive symptoms that closely resemble IBS. Endometriosis occurs when tissue similar to the lining of the uterus grows outside the womb, causing inflammation and pain.Digestive symptoms may include:
- Bloating
- Constipation
- Diarrhoea
- Pain during bowel movements
- Lower abdominal pain
- Excessive gas
- Nausea
One important clue is that symptoms often fluctuate with the menstrual cycle.Women may notice symptoms worsen before menstruation or during periods, as well as around ovulation. However, not everyone experiences this pattern, making diagnosis more challenging.Other symptoms may include:
- Heavy periods
- Painful periods
- Pelvic pain
- Pain during intercourse
- Fertility difficulties
Many women spend years believing they simply have IBS before receiving an endometriosis diagnosis. Recognising symptom patterns and discussing them with both a GP and dietitian can help ensure appropriate referrals are made where necessary.
How an IBS Dietitian Can Help You Find the Right Diagnosis and Support
An
IBS dietitian does much more than provide dietary advice. A comprehensive assessment considers your symptoms alongside your medical history, medications, eating habits, stress levels, physical activity, sleep and lifestyle. The goal is not simply to remove foods but to understand why symptoms are occurring.
Identifying the Real Cause of Your Symptoms
Every person can experience digestive symptoms differently.A dietitian will assess:
- Timing of symptoms
- Relationship with meals
- Bowel habit patterns
- Medication history
- Previous investigations
- Stress and lifestyle factors
- Family history
- Nutritional intake
And more!
This detailed assessment often reveals patterns that are easily missed. A dietitian can help determine whether symptoms fit IBS or whether further medical investigation should be recommended.
Creating a Personalised Nutrition Plan
If IBS is diagnosed, there is no single diet that works for everyone. Effective management depends on understanding your unique symptom triggers.A personalised nutrition plan may include:
- Regular meal patterns
- Fibre optimisation
- Fluid intake advice
- Identification of food triggers
- Low FODMAP dietary guidance where appropriate
- Constipation or diarrhoea management
- Eating strategies to reduce bloating
- Nutritional adequacy throughout treatment
Importantly, the aim is always the least restrictive approach possible while improving symptoms and supporting long-term gut health.
Knowing When Further Medical Investigation Is Needed
Working with a dietitian will play an important role in recognising when symptoms don’t fit the typical IBS picture. If concerning symptoms are identified, your dietitian may recommend following up with to your GP for further assessment.These may include:
- Blood and stool tests
- Coeliac screening
- CT scans
- Referral to a gastroenterologist where appropriate
- Gynaecology referral where appropriate
Frequently Asked Questions
Can IBS be mistaken for other conditions?
Yes. Several digestive conditions cause symptoms very similar to IBS, including coeliac disease, inflammatory bowel disease, food intolerances, SIBO and endometriosis. This is why healthcare professionals need to first assess your symptoms carefully and may recommend further investigations before confirming an IBS diagnosis.
How is IBS diagnosed?
IBS is diagnosed using symptom-based criteria alongside excluding other conditions where appropriate. Your healthcare professional may recommend blood tests, stool tests or additional investigations depending on your symptoms, age, medical history and whether any red-flag symptoms are present.Diagnosis is based on the overall clinical picture rather than a single test.
Can an IBS Dietitian help improve my symptoms?
Yes. An IBS dietitian provides evidence-based nutritional advice tailored to your individual symptoms and lifestyle.Support may include identifying dietary triggers, improving fibre intake, managing constipation or diarrhoea, guiding a low FODMAP approach where appropriate, and ensuring your diet remains nutritionally balanced.Many people experience significant symptom improvement when dietary changes are personalised rather than based on trial and error.
Final Thoughts
Digestive symptoms can be frustrating, unpredictable and sometimes overwhelming. While IBS is common, it’s important to remember that it is not the only condition capable of causing bloating, abdominal pain or changes in bowel habits.Conditions such as coeliac disease, inflammatory bowel disease, food intolerances, SIBO and endometriosis can all present with similar symptoms, and distinguishing between them is essential to ensure the right treatment.Rather than relying on self-diagnosis or unnecessarily restricting your diet, seeking professional assessment can help identify the underlying cause of your symptoms while ensuring more serious conditions are not missed.At
Dietitian Fit, we provide personalised, evidence-based support to help you better understand your digestive health, improve your symptoms and work alongside your GP or specialist whenever further investigation is needed.If you’re experiencing ongoing digestive symptoms, visit our
IBS Dietitian service page to learn more about how we can help. If you’re ready to receive personalised support, you can also
book a consultation with one of our experienced dietitians today.
