I've Been Diagnosed With IBS — Now What?

If you've recently been told you have IBS (irritable bowel syndrome), you're probably left wondering: what actually causes this, and how do I fix it? IBS is best understood as a functional gut disorder — meaning the structure of your digestive tract is typically normal, but the way it functions is impaired. Here's what's actually happening, and what you can do about it.

By Dr. Elizabeth Emrick, ND

What Is IBS, Really?

IBS is a collection of symptoms involving how the gut moves, senses, and responds to food, stress, and inflammation. Most people with IBS experience some combination of:

• Abdominal pain or cramping, typically tied to bowel movements
• Bloating or distension
• Diarrhea, constipation, or a pattern that alternates between the two
• Urgency or a sense of incomplete bowel evacuation

IBS isn't a "we couldn't find anything else" diagnosis. It's diagnosed using an established set of symptom criteria (the Rome IV criteria) — a recognized, positive diagnosis based on your symptom pattern, not just a process of elimination. Your doctor may run basic tests to rule out conditions like celiac disease or inflammatory bowel disease first, but IBS itself stands on its own.

So What Causes It?

There's no single root cause — IBS develops from overlapping imbalances in the gut and nervous system. A few of the biggest contributors:

Gut-brain axis dysregulation. Your gut and brain are in constant communication through nerves, hormones, and immune signals. When this signaling becomes sensitized — often after stress, infection, or inflammation — the gut can become more reactive to normal stimuli like food, gas, or movement.

Altered gut motility. The intestines may move too quickly, too slowly, or in an uncoordinated way, leading to diarrhea, constipation, or alternating bowel habits.

Microbiome imbalance (dysbiosis). This can include small intestinal bacterial overgrowth (SIBO), shifts in beneficial bacteria, or excess gas-producing microbes — all contributors to bloating and discomfort.

Low-grade immune activation. In some cases, mast cells near nerve endings in the gut release chemicals like histamine that amplify pain signals — one reason symptoms can feel intensely real even when standard labs come back normal.

Stress, infections, food intolerances, and hormonal shifts can all act as triggers or amplifiers within this system — which is why IBS symptoms often feel so unpredictable, fluctuating with meals, sleep, stress, and even time of day.

What Can You Actually Do About It?

The encouraging news: IBS responds well to treatment when the underlying drivers are addressed. There's no single cure, but most people see meaningful improvement with a layered, individualized approach.

Start with diet and lifestyle. Regular meals, less caffeine and alcohol, good hydration, and regular movement make a real difference for many people. Some patients benefit from a temporary low-FODMAP approach — reducing certain fermentable carbohydrates that trigger bloating — while others are more sensitive to dairy or gluten specifically. The goal isn't long-term restriction; it's identifying your pattern and working with a dietitian experienced in IBS when possible.

Support the gut microbiome. This might mean reintroducing beneficial bacteria through diet or probiotics, or targeted treatment if SIBO or an infection is identified. Your provider can help determine whether testing makes sense for you.

Calm the gut-brain connection. This matters just as much as digestion itself. Cognitive behavioral therapy (CBT) and gut-directed hypnotherapy are now considered standard-of-care treatments for IBS — not because symptoms are "in your head," but because they're evidence-based tools that reduce the heightened sensitivity between brain and gut. Stress management, sleep, and regular exercise all help lower gut reactivity too.

Consider medication when it's the right fit. Several FDA-approved medications target IBS specifically, depending on your pattern — options exist for constipation-predominant IBS, diarrhea-predominant IBS, and pain. Your doctor can help match the right option to your symptoms.

Address inflammation when it's relevant. For patients where mast cell activity or immune activation plays a role, histamine-reducing strategies may help — this is a rapidly evolving area, and worth discussing with your provider if it sounds like your pattern.

Work on motility. Since IBS-C, IBS-D, and mixed presentations respond differently, this is often where individualized care matters most.

The Bigger Picture

IBS is not "just stress," and it's not "all in your head" — it's a real, physiologic pattern involving your microbiome, nervous system, immune system, and gut motility working together (or not quite in sync).

The most useful shift in how to think about IBS is moving from symptom suppression toward understanding why your system became dysregulated in the first place. When those underlying drivers are addressed, the gut often becomes more resilient and symptoms become less reactive over time.

If you've been recently diagnosed and aren't sure where to start, schedule a consult with Dr. Emrick to map out your unique pattern and build a plan that addresses what's actually driving your symptoms, not just managing them.

Learn more:

• Irritable Bowel Syndrome
• Digestive Health Services

References:

1. Camilleri M. Diagnosis and Treatment of Irritable Bowel Syndrome: A Review. JAMA. 2021.
2. Ford AC, Lacy BE, Talley NJ. Irritable Bowel Syndrome. NEJM. 2017.
3. Wang XJ, Thakur E, Shapiro J. Non-Pharmaceutical Treatments for Irritable Bowel Syndrome. BMJ. 2024.
4. Black CJ, Drossman DA, Talley NJ, Ruddy J, Ford AC. Functional Gastrointestinal Disorders: Advances in Understanding and Management. Lancet. 2020.
5. Chen Y, Feng S, Li Y, et al. Gut microbiota and intestinal immunity — A crosstalk in irritable bowel syndrome. Immunology. 2024.