Understanding your gut health Q&A: Are my symptoms irritable bowel syndrome?

Sounds familiar?

You wake up feeling bloated. Your belly feels “swollen.” You’re always aware of your stomach. Maybe you live tied to the bathroom because you have urgent diarrhea… or the opposite, you go days without a bowel movement. Sometimes the pain in the lower abdomen eases when you finally go. Other times it doesn’t.

This is very common in family medicine. The digestive complaints I hear most often in the clinic are always the same: bloating, constipation, diarrhea, and chronic abdominal pain. And almost always, this question shows up:

“Doctor, is this irritable bowel?”

Let’s speak clearly. I want to tell you when we think about irritable bowel syndrome, known as IBS, and when we should worry about something else that needs more testing.

I’d like you to finish this article knowing three things:

1. What IBS really is.
2. Which warning signs make us look for a more serious cause.
3. What you can start doing today from a lifestyle perspective to feel better.

First: what is IBS, and why it’s not “all in your head”

Irritable bowel syndrome (IBS) is a common disorder of the gut–brain axis.
This means:

• The intestine is more sensitive.
• It moves in an irregular way.
• It overreacts to stress, certain foods, and even changes in sleep.

It is not “you’re imagining it.”
It’s real, and it’s very uncomfortable.

IBS affects quality of life and mood. It affects work. It affects your social plans. It’s very common in women and in people under 50.

The good news:
IBS does not cause intestinal bleeding, does not cause cancer, and does not shorten your life.

My job as your doctor is first to make sure we really are dealing with IBS and not something inflammatory, infectious, or structural.

What are the typical symptoms of IBS?

We use clinical criteria known as Rome IV. Let me translate them without jargon.

To consider IBS, we look for:

• Recurrent abdominal pain, at least one day a week in the last three months,
  and at least two of these three features:
  • The pain is related to bowel movements: it hurts, you go to the bathroom, and the pain changes.
  • The frequency changed: now you go much more often or much less often than before.
  • The form of the stool changed: looser, harder, more irregular.

And these symptoms didn’t start yesterday. They should have started at least six months ago.

Bloating (“I feel swollen”) is very common in IBS, although it’s not strictly required for the diagnosis.

When a patient meets these criteria and doesn’t have alarm signs, I can make a positive diagnosis of IBS. I don’t need to “rule out everything” with colonoscopies and CT scans in every case. That old practice of ordering “the whole battery of tests” for everyone with IBS-type symptoms is no longer the recommended approach.

Not all IBS looks the same: subtypes

IBS is classified according to the predominant bowel habit:

• IBS with constipation (IBS-C): hard, lumpy stools, straining to pass stool.
• IBS with diarrhea (IBS-D): loose or watery stools most of the time.
• Mixed IBS (IBS-M): sometimes diarrhea, sometimes constipation.
• Unclassified IBS: doesn’t clearly fit into the groups above.

This matters because treatment changes depending on the subtype.

When should I not settle for “it’s probably IBS”?

Here’s where I put on my most serious family doctor hat.
If you have any of these features, I need to investigate further before calling it IBS:

• Visible blood in the stool
• Unintentional weight loss
• Recurrent fever
• Anemia on blood work
• Chronic watery diarrhea in an older adult
• Family history of colon cancer, inflammatory bowel disease (ulcerative colitis or Crohn’s), or celiac disease
• Recent onset of intense symptoms after age 50

In these situations I do order additional tests, such as endoscopy or colonoscopy with biopsies, because we need to rule out other causes like inflammatory bowel disease, celiac disease, microscopic colitis, or chronic infection.

Especially in older adults with watery diarrhea lasting more than four weeks, I often consider a colonoscopy with biopsies to rule out microscopic colitis, a treatable cause that can be missed if we don’t take tissue samples.

So why so much diarrhea? Could it be infection? Or celiac disease?

Good question.

When someone comes with diarrhea lasting more than four weeks, I want to answer three basic questions:

1. Is there celiac disease?

I order blood tests for IgA anti–tissue transglutaminase antibodies.
If the patient has IgA deficiency, I use the IgG versions.

That helps me detect celiac disease, which can cause chronic diarrhea, bloating, and fatigue.

2. Is there a treatable infection like Giardia?

Giardia is a parasite that can cause watery diarrhea, urgency, and very strong-smelling gas.

We detect it with a stool antigen test or PCR. If I identify and treat it, symptoms often improve significantly. I don’t need to order “every stool parasite test” for everyone—unless there’s recent travel or other risk factors that justify it.

3. Is there true intestinal inflammation?

For this, I use stool markers like fecal calprotectin or fecal lactoferrin.

If they’re elevated, I think about inflammatory bowel disease (ulcerative colitis or Crohn’s), which does require specialist care with gastroenterology.

These markers outperform general blood tests like ESR or CRP when detecting localized inflammation in the intestine.

Another common cause of chronic diarrhea is bile acid diarrhea—too much bile acid reaching the colon. If I don’t have access to a specific test, I may try an empirical treatment with a bile acid binder. If symptoms improve, that gives me both a diagnostic clue and a therapeutic tool.

In practical terms:
In chronic diarrhea with an IBS-D pattern, I don’t start with colonoscopy and CT scans for everyone.

I start with:

• Tests for celiac disease
• Giardia
• Stool inflammation markers

And I think about bile acids. That’s the most efficient and evidence-based route today.

“What if mine started after a terrible stomach bug?”

I hear this a lot:

“Ever since that awful food poisoning on vacation, I’ve never been the same.”

You’re not imagining it.

We know that after an acute gastroenteritis from bacteria, viruses, or parasites, some people develop what we call post-infectious irritable bowel syndrome.

We also see an increase in functional dyspepsia—that discomfort high in the abdomen, feeling full too quickly, mild nausea, frequent burping.

Recent studies show that three months or more after that acute infection, about 1 in 7 people still have IBS-type symptoms, especially diarrhea and abdominal pain. In several follow-ups, up to 40 percent of those patients still had symptoms five years later.

Knowing this helps emotionally. I tell my patients:

“Your gut changed after that infection. You’re not exaggerating. And yes, we’ll treat and manage it like IBS.”

Okay, doctor. Let’s say I do have IBS. What do I do now?

IBS treatment is not a single pill. It’s a layered plan.

I always start with the pillars of lifestyle medicine, because when patients adopt them, they usually sleep better, have less pain, and feel more in control.

Food: what and how you eat

Your gut reacts to what you eat—but not in the same way as your neighbor’s gut.

Some general principles:

• Regular meals and good hydration.
  Try not to skip food for many hours and then eat a huge meal all at once.
• Less caffeine and alcohol if you notice they trigger urgency or pain.
• Soluble fiber (for example, oats and psyllium) is especially helpful when constipation predominates.
  Raw, insoluble fiber like bran can sometimes worsen bloating in some people.
• Low-FODMAP diet when symptoms are significant, especially in IBS-D:
  This approach reduces certain fermentable carbohydrates that draw water into the gut and produce gas, triggering pain, bloating, and diarrhea.

It works—but it’s not meant to be “forever.”
It’s done in three steps:

1. Short-term restriction
2. Controlled reintroduction
3. Personalization

The final goal is to identify your true triggers, not to ban half the supermarket for life.

A very useful recent insight:
Not all FODMAPs seem to bother people equally.

Two groups—

• Fructans (wheat, onion, garlic)
• Galacto-oligosaccharides (legumes like beans and lentils)

—are the ones that most consistently trigger pain and bloating.

In small U.S. studies, eliminating only these two groups gave similar relief to the full low-FODMAP plan, but with less burden and better adherence. This “simplified” strategy may be enough for many patients.

A recent study published in Annals of Internal Medicine in October 2025 showed a promising alternative for people with IBS: the Mediterranean diet. The results were clear: 62% of those who followed it had significant improvement in their symptoms.

The most remarkable part wasn’t only symptom relief, but the simplicity and sustainability of the approach.

Low-FODMAP can be useful in some cases, but it’s complex and expensive to maintain. The Mediterranean diet offers a more flexible, realistic framework, with proven benefits for heart, metabolism, and mental health.

In the coming weeks, I’ll publish another article where I’ll go deeper into this eating pattern and how to make it part of your daily life in a practical way.

For IBS-D, I might also consider:

• Loperamide or other anti-diarrheal medications for occasional use.

For IBS-C:

• Gentle osmotic laxatives or specific prescription agents.

These decisions are personalized.

Movement: your gut likes it when you move

The human body is not made to sit all day.

Regular exercise:

• Improves intestinal transit
• Lowers baseline stress levels
• Improves sleep

People who go from a very sedentary life to regular movement (brisk walking, gentle swimming, stationary bike) often notice less abdominal pain and less bloating.

Restorative sleep

Poor or insufficient sleep:

• Worsens pain perception
• Makes the gut even more sensitive

Keeping regular sleep schedules becomes part of the treatment, not a luxury.

Stress management: your brain and gut are constantly talking

Your gut and your brain talk to each other all day long.

When you live in constant “alarm” mode, your colon feels it.

That’s why:

• Cognitive behavioral therapy (CBT) focused on digestive symptoms
• And gut-directed hypnotherapy

…have both been shown to:

• Reduce pain
• Improve bowel habits

These therapies work even in severe cases and are not “last resort” options. They’re part of the package for many people with IBS.

Relationships and support

This is not a minor point.

Social isolation and shame about symptoms (the fear of “I’m going to get diarrhea at the office”) increase anxiety—and that, in turn, worsens symptoms.

Talking about it, having a support network, and normalizing the condition are part of the treatment.

Avoiding risky substances

Tobacco, excess alcohol, and other intestinal irritants:

• Maintain low-grade inflammation
• Alter gut motility
• Worsen reflux and other symptoms

Cutting back (or quitting) helps with IBS symptoms and with your overall health.

What about “stronger” medications?

Sometimes we do need them, especially when abdominal pain is intense and daily.

Two important scenarios:

1. IBS-D with pain and diarrhea that doesn’t respond to basics

Here I consider two evidence-based options:

• Low-dose tricyclic antidepressants, such as amitriptyline at bedtime.

Let me clarify something important:
Here we don’t use them primarily as antidepressants, but as modulators of intestinal pain and motility.

In a large primary care trial with more than 400 patients with hard-to-treat IBS, very low doses of amitriptyline (10–30 mg at night, adjusted to tolerance) led to:

• Clinically meaningful improvement in global IBS severity scores
• More patients saying, “I feel better,” compared with placebo.

The difference wasn’t magical, but it was real—and most people tolerated the medicine. The most common side effects were dry mouth and drowsiness (typical anticholinergic effects). Interestingly, those same side effects can be useful in people with diarrhea-predominant IBS.

• Other IBS-D–specific medications exist (for example, secretory modulators, antispasmodics). I choose them based on symptom severity and contraindications, and always individualize.

2. Chronic abdominal pain with visceral hypersensitivity

When pain is the main issue, in addition to tricyclics I often discuss:

• Gut-focused CBT
• Gut-directed hypnotherapy

In the best meta-analyses available, these interventions:

• Reduce persistent pain
• Improve global IBS symptoms

No single technique clearly outperforms the other, but both help.

And acupuncture?

In adults with diarrhea-predominant IBS, a recent clinical trial compared:

• Traditional acupuncture
  vs.
• Sham (simulated) acupuncture

More people in the real acupuncture group achieved sustained relief of abdominal pain and better stool consistency. The difference was clinically meaningful.

It was not a miracle cure—but it’s one more option, especially if you’re open to complementary medicine.

And peppermint oil?

Enteric-coated peppermint oil capsules have been recommended for years because they relax intestinal smooth muscle and can reduce spasms.

In a recent controlled trial with patients with moderate to severe IBS, both peppermint oil and placebo improved global symptoms almost equally over six weeks.

What do I do with that information?

I’m honest with my patients. I say:

“You can try it if you prefer something ‘natural,’ but know that it doesn’t always do better than placebo and it can increase reflux and heartburn.”

When should I see a gastroenterologist?

I refer to gastroenterology when:

• There are red flags
  (blood in stool, weight loss, anemia, fever, strong family history)
• I suspect inflammatory bowel disease
• Chronic watery diarrhea doesn’t improve and I need biopsies to rule out microscopic colitis
• Abdominal pain remains severe despite lifestyle changes, guided dietary adjustments, and a first trial of pharmacologic therapy
• I need advanced therapies specific to the IBS subtype (for example, some secretory modulators not always available in primary care)

What I want you to remember

• Your pain, your bloating, and your change in bowel habits are real.
  It’s not drama or weakness.
• IBS is diagnosed based on clinical history, not on an endless list of tests.
  Recurrent abdominal pain associated with changes in stool frequency or form, without red flags, is almost enoughto call it IBS.
• Before labeling chronic diarrhea as “just IBS,” we should rule out a few treatable causes:
  celiac disease, Giardia, intestinal inflammation, and bile acid diarrhea.
• Management begins with your daily life:
  Eating real, mostly plant-based foods, identifying your personal trigger carbohydrates, moving more, sleeping better, lowering your stress load, and maintaining relationships that support you.
  That’s lifestyle medicine applied to your gut.
• If you need medication, it does not mean you failed.
  It means your intestine needs some extra help.
  Options like low-dose amitriptyline, gut–brain therapies, and even acupuncture have evidence behind them.

My goal as a family and lifestyle medicine physician is for you to understand your body, regain a sense of control, and stop living in fear of the nearest bathroom.

Final note to the reader

This article offers general guidance. It does not replace a personal medical evaluation, especially if you have:

• Blood in your stool
• Recent weight loss
• Severe pain that wakes you at night

If that’s happening, please seek in-person medical care.

🌍 This article is also available in Spanish. Please use the language switcher in the top menu.

Sources

Chey WD, Hashash JG, Manning L, Chang L. AGA clinical practice update on the role of diet in irritable bowel syndrome: Expert review. Gastroenterology. 2022;162(6):1737-1745.e5. doi:10.1053/j.gastro.2021.12.248.

Ford AC, Sperber AD, Corsetti M, Camilleri M. Irritable bowel syndrome. Lancet. 2020;396(10263):1675-1688. doi:10.1016/S0140-6736(20)31548-8.

Memel ZN, Shah ND, Beck KR. Diet, nutraceuticals, and lifestyle interventions for the treatment and management of irritable bowel syndrome. Nutr Clin Pract. 2025. doi:10.1002/ncp.11307.

Chey WD, Keefer L, Whelan K, Gibson PR. Behavioral and diet therapies in integrated care for patients with irritable bowel syndrome. Gastroenterology. 2021;160(1):47-62. doi:10.1053/j.gastro.2020.06.099.

Singh P, Tuck C, Gibson PR, Chey WD. The role of food in the treatment of bowel disorders: Focus on irritable bowel syndrome and functional constipation. Am J Gastroenterol. 2022;117(6):947-957. doi:10.14309/ajg.0000000000001767.

Surdea-Blaga T, Cozma-Petrut A, Dumitraşcu DL. Dietary interventions and irritable bowel syndrome—What really works? Curr Opin Gastroenterol. 2021;37(2):152-157. doi:10.1097/MOG.0000000000000706.

Ford AC, Lacy BE, Talley NJ. Irritable bowel syndrome. N Engl J Med. 2017;376(26):2566-2578. doi:10.1056/NEJMra1607547.

Cozma-Petruţ A, Loghin F, Miere D, Dumitraşcu DL. Diet in irritable bowel syndrome: What to recommend, not what to forbid to patients! World J Gastroenterol. 2017;23(21):3771-3783. doi:10.3748/wjg.v23.i21.3771.

Camilleri M. Diagnosis and treatment of irritable bowel syndrome: A review. JAMA. 2021;325(9):865-877. doi:10.1001/jama.2020.22532.

Bamidele JO, et al. The Mediterranean diet for irritable bowel syndrome: A randomized clinical trial. Ann Intern Med. Published online October 28, 2025. doi:10.7326/ANNALS-25-01519.