IBS Doctor in Oklahoma City

By Venturis Clinic, Oklahoma City · Updated October 2026

If you have had belly pain, bloating, constipation or diarrhea for months, and your tests keep coming back normal, an IBS doctor who looks at the whole picture can help you find out what is driving it. At Venturis Clinic in Oklahoma City, we start with a long listening consult and a Good Faith Exam, review the workup you have already had, and use GI and SIBO breath testing where it adds real information. This page explains what IBS is, why standard tests are often normal, how we work it up, and what a first visit looks like.

This page is educational. It is not a diagnosis, and gut symptoms have many possible causes.

What is IBS?

Irritable bowel syndrome (IBS) is a common long-term condition of the gut. Doctors now describe it as a disorder of gut-brain interaction: the bowel looks normal, but the way the gut moves, senses and communicates with the nervous system is not working as it should.

Doctors usually diagnose IBS using the Rome IV criteria: belly pain on average at least one day a week over the last three months, linked to bowel movements, to a change in how often you go, or to a change in what stool looks like. IBS is often grouped by the main bowel pattern:

• IBS-C, mostly constipation
• IBS-D, mostly diarrhea
• IBS-M, mixed, swinging between the two

Common signs of IBS

• Cramping or belly pain that often eases, or changes, after a bowel movement
• Bloating and a swollen belly, often worse as the day goes on
• Constipation, diarrhea or both
• Gas, urgency or a feeling of not finishing
• Mucus in the stool
• Symptoms that flare with certain foods, stress, poor sleep or the menstrual cycle

Many people with IBS also live with fatigue, headaches, poor sleep, anxiety or other conditions such as fibromyalgia, mast cell activation syndrome (MCAS) or dysautonomia with gut problems.

When to see a doctor right away

Some symptoms are not typical of IBS and need prompt medical evaluation, often including a gastroenterologist and a colonoscopy:

• Blood in the stool or black, tarry stool
• Weight loss you cannot explain
• Symptoms that wake you from sleep
• Fever, or anemia on blood work
• New bowel symptoms starting after age 45 to 50
• A family history of inflammatory bowel disease, celiac disease or colon disease
• Severe or worsening pain

If you have severe belly pain, vomiting blood or a high fever, call 911 or go to an emergency room.

Why standard tests often come back normal

Being told “your colonoscopy is normal, it’s just IBS” is frustrating. But a normal colonoscopy, normal blood count and normal imaging are expected in IBS, because IBS is a problem of function rather than visible damage. Those tests matter: they rule out other conditions. They just do not explain why your gut is behaving the way it is.

Things standard tests often do not look at include:

• Small intestinal bacterial overgrowth (SIBO), where more bacteria than usual live in the small intestine. It overlaps with IBS in some people and is checked with a breath test.
• The balance of gut bacteria and markers of digestion and inflammation, which comprehensive stool testing can measure.
• Food triggers, such as fermentable carbohydrates (FODMAPs), which are best found with a guided elimination and reintroduction.
• Gut symptoms that began after an infection, including food poisoning or COVID. Post-infection IBS is a recognized pattern. See constipation and gut problems after COVID.
• Overlapping conditions such as MCAS, dysautonomia, mold-related illness or thyroid problems, which can affect the gut too.

How Venturis works up IBS

We act as a gut health doctor’s office that takes time. All care is performed by licensed medical staff under our medical director, and we work alongside your gastroenterologist or primary care doctor rather than replacing them.

1. Listening consult. When symptoms started, what makes them better or worse, your diet, medications, stress, sleep, menstrual history and past infections.
2. Good Faith Exam. A medical exam by our licensed medical staff before any testing or care plan.
3. Review of prior workup. Colonoscopy, endoscopy, imaging and blood work you have already had, so nothing is repeated without a reason. If red flags have not been checked, we help you get that done first.
4. GI and SIBO breath testing. Where it adds useful information, we may order SIBO breath testing and comprehensive stool panels. We explain what each test can and cannot tell you. See our lab testing page for the panels we use.
5. Basic labs if missing. For example, celiac screening, thyroid and iron studies, when they have not already been done.
6. A written plan. Based on what we find, not a one-size protocol.

What an IBS care plan can include

Plans are individual. Depending on your workup, they may include:

• Diet changes, such as a guided low-FODMAP trial with a structured reintroduction, so the diet does not stay restrictive for longer than needed
• Changes to fiber type and amount, hydration and meal timing
• Targeted next steps if SIBO breath testing or stool testing is abnormal
• Support for sleep, stress and the gut-brain connection, which research shows can affect IBS symptoms
• Coordination with your gastroenterologist or primary care doctor for prescriptions or further testing

We do not promise that IBS will go away. Many people find their symptoms become more predictable and manageable once triggers and overlapping problems are identified.

Care options at Venturis

IBS is often not the only thing going on. When your Good Faith Exam and testing point to an overlapping condition, our team may discuss other options for that condition:

• EBOO therapy in Oklahoma City is not a gut treatment, and we do not offer it for IBS. It is sometimes discussed for patients whose workup shows an overlapping condition such as long COVID or mold-related illness.
• If labs show low nutrient levels or poor absorption, IV nutrients such as a Myers’ cocktail IV may be discussed. See the full IV therapy menu.

These are options that may be discussed after the Good Faith Exam, not a standard part of IBS care, and no specific result is promised.

What your first visit looks like

• Before the visit: a free 15-minute discovery call to see whether we are a good fit, then intake forms. Bring or send any prior colonoscopy, imaging and lab reports.
• The visit: a long consult and your Good Faith Exam, usually 60 to 90 minutes.
• After: a testing plan if needed, with home stool or breath test kits explained step by step.
• Results visit: we go through results with you in plain language and agree on a written plan.

Related gut and overlap topics

• Constipation and gut problems after COVID
• Dysautonomia and gut problems
• MCAS treatment in Oklahoma City
• All conditions we see
• Patient Education Library

IBS FAQ

What kind of doctor treats IBS?

Primary care doctors and gastroenterologists diagnose and manage IBS. A functional or integrative clinic like Venturis adds a longer consult, testing such as SIBO breath tests and stool panels, and attention to diet, sleep, stress and overlapping conditions. We work alongside your GI doctor.

My colonoscopy was normal. Can I still have IBS?

Yes. A normal colonoscopy is expected in IBS. It helps rule out other conditions, but it does not explain gut function.

Is IBS the same as SIBO?

No. SIBO is an overgrowth of bacteria in the small intestine, found with a breath test. Some people with IBS symptoms have SIBO and many do not. Breath tests have limits and can give false results, so we interpret them alongside your symptoms.

Do you do SIBO breath testing?

Yes. When it is likely to help, we order SIBO breath testing done at home and explain how to prepare. See our lab testing page.

Can IBS start after COVID or food poisoning?

Yes. IBS that begins after a gut infection is a recognized pattern, and gut symptoms after COVID are common. The workup is similar.

Do you take insurance?

Venturis is direct-pay. Cost is discussed at consult, and the cost of any lab test is explained before anything is ordered.

Venturis Clinic is at 7917 N. May Ave, Oklahoma City, OK 73120. We see patients from Oklahoma City and surrounding areas, including Edmond, Norman and Tulsa.

This page is for educational purposes and is not a diagnosis or a substitute for individual evaluation. No specific result is promised, and individual results vary. A Good Faith Exam by licensed medical staff is required before any testing or care.