Many people think bloating is just trapped gas from something they ate. In reality, bloating is a symptom that can come from diet, bowel habit changes, functional disorders like irritable bowel syndrome, bacterial overgrowth, delayed stomach emptying, or less commonly, organ related conditions such as liver disease or ovarian masses.

How we approach bloating when you come to our practice

We start by separating harmless, short lived bloating from patterns that deserve testing. That means a focused history, a physical exam, and targeted tests when appropriate. As a gastroenterology team led by Dr. Alan R. Plumer, MD, we look for clues that point to a dietary cause, a functional disorder, an infection, structural problem, or a systemic condition that needs a hepatology consult or other specialist care.

If you want to learn more about the role of a gastroenterologist in evaluating symptoms like bloating, see our gastroenterologist page.

Common causes people miss

Bloating often gets blamed on one thing, but multiple factors can add up. Here are the causes we see most often in clinical practice.

  • Dietary and swallowed air. Eating quickly, chewing gum, drinking through a straw, and carbonated drinks all increase swallowed air. Certain foods ferment in the gut and produce gas, especially high FODMAP foods such as some fruits, dairy, wheat, onions, and legumes.
  • Constipation or slow transit. When stool builds up, the abdomen can feel and look distended. Patients sometimes dismiss constipation as normal, but it commonly causes persistent bloating.
  • Functional bowel disorders. Irritable bowel syndrome, especially the bloating predominant type, causes chronic abdominal fullness and bloating even without obvious structural disease.
  • Small intestinal bacterial overgrowth, or SIBO. SIBO can cause gas, bloating, and changes in bowel habits when bacteria that normally live in the colon grow in the small intestine.
  • Delayed stomach emptying. Gastroparesis makes the stomach slow to empty, so food stays in the stomach longer and causes bloating and early fullness.
  • Food intolerances and celiac disease. Lactose intolerance, fructose intolerance, and celiac disease all cause bloating after eating trigger foods.
  • Medication side effects. Many commonly used medicines slow bowel transit or alter gut flora and contribute to bloating.
  • Fluid in the abdomen or organ enlargement. Ascites from liver disease or ovarian masses can produce persistent abdominal distension. When we suspect a liver related issue we may coordinate care with a hepatologist.

How we decide which tests to use

Not every patient needs every test. We choose tests based on the history and exam, and on what problem we think is most likely.

Initial tests we commonly use

  • Blood tests to screen for inflammation, celiac disease, liver function, or anemia.
  • Stool tests to check for infection, inflammation, or fat malabsorption. See our stool tests topic to understand what these tests look for.
  • Breath testing for suspected SIBO or carbohydrate malabsorption when the clinical pattern fits.
  • Imaging such as abdominal ultrasound or CT when we suspect ascites, organ enlargement, or a structural problem.
  • Endoscopic tests. Upper endoscopy or colonoscopy may be recommended if we suspect structural disease, celiac disease, peptic disease, or to evaluate chronic symptoms. Learn more about colonoscopy and when it is appropriate.

We try to order just enough testing to answer the question. That reduces unnecessary procedures and gets you a clear plan faster.

Signs that bloating may be a more serious problem

Most bloating is not life threatening, but we pay special attention to certain red flags that require prompt evaluation.

Watch for these warning signs

  • Unintentional weight loss along with bloating.
  • Visible, persistent abdominal swelling rather than bloating that comes and goes.
  • Blood in the stool, black tarry stools, or unexplained iron deficiency anemia.
  • New severe abdominal pain, persistent vomiting, or inability to pass stool or gas.
  • Jaundice, or yellowing of the skin and eyes.

Watch out: sudden severe pain, repetitive vomiting, or inability to pass gas and stool are reasons to seek emergency care. These symptoms can indicate obstruction, perforation, or other urgent problems.

Practical steps we recommend before and during your visit

You do not need to fix bloating on your own before seeing us. Still, a few simple steps help make the evaluation more productive and may improve symptoms while you wait for an appointment.

  1. Keep a brief food and symptom diary. Note what you eat, when bloating starts, and related bowel changes. This helps us spot patterns that point to intolerances, high FODMAP foods, or timing suggestive of gastroparesis.
  2. Review recent medications. Bring a list of prescriptions, over the counter medicines, and supplements. Some drugs slow the gut or change flora and contribute to bloating.
  3. Measure bowel habits. Note frequency and consistency. If you are constipated, describing how long it has lasted and what helps gives us useful clues.

Pro tip: A short trial reducing carbonated drinks and processed high FODMAP foods often reduces bloating enough to provide useful diagnostic information. We can advise on whether a supervised elimination trial or referral to a dietitian is appropriate for you.

What a gastroenterologist does differently

As gastroenterologists we integrate symptom patterns with targeted testing and minimally invasive procedures. That means:

  • Interpreting breath tests, blood work, stool studies, and imaging together so results are not looked at in isolation.
  • Using endoscopy selectively when it will change management, such as checking for celiac disease or peptic disease, or performing a diagnostic colonoscopy when needed.
  • Coordinating with hepatology for liver related causes, and with gynecology when pelvic causes are suspected.

For more about how gastroenterologists evaluate upper gastrointestinal symptoms, see our dyspepsia causes topic and our page about H Pylori infection.

Common misconceptions patients bring to the visit

Addressing common misunderstandings helps set realistic expectations.

  • Misconception: Bloating always means excess gas. Sometimes bloating is fluid retention, constipation, or a swollen organ, not just gas.
  • Misconception: Over the counter remedies fix most cases. For occasional gas related bloating these remedies can help, but persistent bloating deserves evaluation to rule out underlying conditions.
  • Misconception: Normal imaging means no problem. Functional disorders like IBS or motility problems may show normal imaging and still require targeted testing and symptom management.

Frequently asked questions

Is bloating the same as abdominal distension?

Bloating describes the sensation of fullness or pressure. Distension describes visible enlargement of the abdomen. They often occur together, but not always. Both are symptoms we evaluate together.

Can food intolerances cause bloating long term?

Yes. Lactose intolerance, fructose malabsorption, and celiac disease can cause repeated bloating after eating trigger foods. Testing or an elimination trial guided by a clinician helps identify these causes without unnecessarily restricting your diet.

When should I worry about bloating?

We consider weight loss, persistent visible swelling, blood in the stool, jaundice, or severe pain as warning signs that need prompt medical evaluation. Otherwise, increasing or persistent symptoms over weeks should be checked by a gastroenterologist.

How will you test me for SIBO and other causes?

We may use breath testing to evaluate for SIBO, blood or stool tests to check for celiac disease or infection, and imaging when structural disease is suspected. Endoscopic procedures can be used selectively. Your history guides which tests are appropriate.

Can a colonoscopy find the cause of bloating?

Colonoscopy can detect polyps, inflammatory bowel disease, or structural abnormalities that might explain symptoms. It is a useful test when bowel habit changes, bleeding, or other concerning signs are present. Learn more about colonoscopy and what it can show.

Key takeaway

Bloating is a common symptom with many possible causes, from diet and constipation to functional disorders, bacterial overgrowth, delayed stomach emptying, and less commonly, organ related problems. We use a focused history, selective testing, and collaboration with hepatology or gynecology when needed to find the cause and guide treatment.

To learn more about tests and topics we commonly use when evaluating bloating, see our pages on Gastroenterologist services, Dyspepsia Causes, and visit our locations page for details about where we serve Phillipsburg, New York and surrounding communities.

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