Irritable Bowel Syndrome (IBS)

What to know about IBS

• IBS is defined by a pattern of abdominal pain and altered bowel habits; it is not simply “a sensitive stomach.”
• IBS-C is constipation-predominant, IBS-D is diarrhea-predominant, and IBS-M alternates between constipation and diarrhea.
• There is no single IBS test. Clinicians use the symptom pattern and selected tests to rule out conditions that need different treatment.
• A low-FODMAP trial can help some people, but it is meant to be temporary and guided by a qualified clinician or dietitian—not a permanent list of forbidden foods.
• Blood in the stool, unexplained weight loss, anemia, fever, nighttime symptoms, or a strong family history of digestive disease deserves medical evaluation rather than self-treatment.

What is IBS?

IBS is a long-term digestive condition in which the communication between the intestines and the nervous system can become more sensitive or poorly coordinated. Motility, intestinal sensation, the gut microbiome, immune signaling, stress physiology, and food-related triggers may all influence symptoms. That does not mean IBS is “all in your head.” The pain and bowel changes are real; the gut and brain communicate in both directions.

IBS symptoms often wax and wane. A person may have several difficult weeks followed by a quieter period, then flare after an infection, a major stressor, a medication change, travel, disrupted sleep, or a food pattern that does not work well for them. The goal is not to chase every symptom with a new restriction. The goal is to understand the pattern, protect nutrition and quality of life, and build a plan that is safe to adjust over time.

IBS-C, IBS-D, and IBS-M

Clinicians commonly describe IBS by the predominant stool pattern. These labels help guide treatment, but they are not permanent identities. A patient’s pattern can change over time, and some people have symptoms that do not fit neatly into one category.

• IBS-C (constipation-predominant): constipation or hard stools are the dominant bowel pattern, often with straining, incomplete evacuation, bloating, or abdominal pain.
• IBS-D (diarrhea-predominant): loose or watery stools are dominant, sometimes with urgency, frequent bowel movements, cramping, or fear of being away from a restroom.
• IBS-M (mixed): constipation and diarrhea both occur, often in alternating episodes.
• IBS-U (unclassified): symptoms suggest IBS, but the stool pattern does not consistently fit the other categories.

Symptoms people experience

The defining symptom is recurring abdominal pain associated with bowel movements or a change in how often stools occur or what they look like. Pain may be cramping, aching, sharp, or diffuse. Some people feel better after a bowel movement; others feel worse. Bloating and visible abdominal distension are also common and can be more distressing than the pain itself.

Other symptoms may include urgency, straining, a sensation of incomplete emptying, mucus in the stool, nausea, or discomfort after eating. IBS can affect sleep, work, exercise, travel, intimacy, and social plans. Anxiety and low mood may accompany chronic symptoms, but they do not invalidate the physical experience. They are part of the whole health picture that deserves support.

• Abdominal pain or discomfort that relates to bowel movements
• Constipation, diarrhea, or an alternating pattern
• Bloating, abdominal pressure, gas, or visible distension
• Urgency, straining, or incomplete evacuation
• Symptoms that vary with meals, stress, sleep, travel, or menstrual cycles

How IBS is evaluated

There is no single blood test, scan, or stool test that proves someone has IBS. A clinician usually starts with a detailed history: when symptoms began, how often they occur, how they relate to bowel movements and meals, whether they wake you at night, and how they affect daily life. A physical examination and review of medications, supplements, prior infections, surgeries, family history, and diet can reveal important clues.

Testing is individualized. Depending on the history, clinicians may consider a complete blood count, markers of inflammation, celiac screening, thyroid testing, stool studies, or other evaluation. Testing can also be appropriate when symptoms are new, severe, changing, or not responding as expected. Comprehensive stool testing and breath testing may be useful in selected situations, but a test should answer a specific clinical question; more testing is not automatically better.

IBS should not be used to explain away a new alarm symptom. If a clinician suspects inflammatory bowel disease, celiac disease, infection, medication effects, a pelvic or gynecologic condition, or another diagnosis, that concern should be evaluated through the appropriate conventional medical pathway.

Why IBS symptoms can flare

IBS does not have one cause. Different people have different drivers, and more than one can be present at the same time. A bout of gastroenteritis can be followed by post-infectious IBS. Altered motility may contribute to constipation or diarrhea. Visceral hypersensitivity can make normal intestinal movement feel painful. Changes in sleep, stress physiology, movement, or the menstrual cycle can change the intensity of symptoms without meaning the symptoms are imagined.

Food is often part of the pattern, but a food that triggers one person may be well tolerated by another. Large meals, rapid eating, alcohol, excess caffeine, carbonated beverages, high-fat meals, or specific fermentable carbohydrates may aggravate symptoms for some patients. Keeping a short, focused symptom and food diary can be more helpful than eliminating dozens of foods indefinitely.

• Post-infectious changes after a stomach or intestinal infection
• Constipation, diarrhea, or changes in intestinal motility
• Visceral sensitivity and the gut-brain connection
• Sleep disruption, chronic stress, or insufficient recovery
• Food intolerances, meal size, eating speed, or highly restrictive patterns
• Medication or supplement effects, including some antibiotics, laxatives, iron, and magnesium products

Treatment is personalized

IBS treatment is usually a sequence of manageable experiments rather than one universal cure. A clinician may begin with regular meals, adequate hydration, gradual activity, sleep support, and a review of medications and supplements. Soluble fiber can help some people, especially when introduced slowly with enough fluid; large sudden increases in fiber can worsen gas or bloating. The best option depends on the stool pattern and the person’s medical history.

Medication can be appropriate. Depending on the presentation, a conventional clinician may recommend treatments for constipation, diarrhea, abdominal pain, or another specific symptom. Some patients benefit from psychological therapies that target the gut-brain connection, such as cognitive behavioral therapy or gut-directed hypnotherapy. These are not a suggestion that symptoms are psychological; they are ways to reduce nervous-system amplification and improve coping with a real chronic condition.

At NaturoMedica, a naturopathic physician may combine conventional evaluation with nutrition counseling, selected functional testing, lifestyle support, and carefully chosen supplements or prescription therapies when appropriate. Recommendations should account for pregnancy, age, kidney or liver disease, allergies, medications, and the possibility of a different diagnosis. “Natural” does not automatically mean safe, and supplements can affect medications or bowel function.

The low-FODMAP approach: useful, but not forever

A low-FODMAP diet reduces certain short-chain carbohydrates that are poorly absorbed by some people and can be fermented in the gut. It may reduce bloating, gas, pain, or altered stools for some patients. It is not a treatment for every person with IBS, and it is not the same as avoiding all carbohydrates, gluten, or healthy plant foods.

A responsible low-FODMAP process generally has three phases: a short elimination trial, systematic reintroduction, and personalization. The purpose is to identify an individual’s tolerance—not to remain on the most restrictive phase indefinitely. Long-term unnecessary restriction can reduce dietary variety, fiber, and enjoyment of food and can increase the risk of inadequate nutrition or a difficult relationship with eating. A registered dietitian or clinician with appropriate training can make the process safer and more useful.

How NaturoMedica can help

Patients from Issaquah, Sammamish, Bellevue, Redmond, Renton, Kirkland, and the wider Eastside often seek NaturoMedica when digestive symptoms have continued despite basic advice or when they want a more complete review of the pattern. The first step is listening carefully: what you feel, what you have already tried, what has helped or harmed, and what you need to be able to do again.

An individualized visit may include a health history, physical examination, review of prior labs and imaging, medication and supplement review, and a discussion of whether additional evaluation is appropriate. Depending on the clinical question, related services may include nutrition counseling, functional testing, or acupuncture. These services are complements to—not replacements for—urgent evaluation, gastroenterology care, colonoscopy when indicated, or other conventional medical treatment.

Bring a list of medications and supplements, prior test results, a brief timeline of symptoms, and questions about food, bowel patterns, and treatment goals. You do not need to arrive with a perfect diet diary or a self-diagnosis. A clear account of what is happening is more valuable than weeks of aggressive restriction.

When to seek care

IBS is uncomfortable, but certain symptoms are not typical of uncomplicated IBS and should be evaluated promptly. Seek urgent care for severe or rapidly worsening abdominal pain, a rigid or swollen abdomen with vomiting, fainting, signs of dehydration, or inability to pass stool or gas. Contact a clinician promptly for any blood in the stool, black or tarry stool, unexplained weight loss, persistent fever, anemia, repeated nighttime symptoms, or a strong family history of colorectal cancer, inflammatory bowel disease, or celiac disease.

If symptoms are new, change substantially, begin later in life, or interfere with eating, sleep, work, or daily functioning, make an appointment rather than self-treating indefinitely. The aim is a confident, safe plan—not simply a label.

Symptoms that need medical attention

These symptoms are not typical of uncomplicated IBS. Contact a clinician promptly, or seek urgent care when symptoms are severe.

• Blood in the stool or black, tarry stool
• Unexplained weight loss or loss of appetite
• Persistent fever, anemia, or marked fatigue
• Symptoms that repeatedly wake you from sleep
• Severe, rapidly worsening, or localized abdominal pain
• Persistent vomiting, dehydration, or inability to pass stool or gas
• A strong family history of colorectal cancer, inflammatory bowel disease, or celiac disease
• New or substantially changed symptoms, especially later in adulthood

IBS FAQs

Is IBS the same as inflammatory bowel disease?

No. IBS is a disorder of gut-brain interaction and does not cause the intestinal inflammation and tissue damage associated with Crohn’s disease or ulcerative colitis. Symptoms can overlap, so persistent or alarm symptoms need medical evaluation.

Can IBS be cured?

There is no single cure that works for everyone, but many people can substantially reduce symptoms and improve daily life with an individualized plan. Symptoms may change over time, so treatment often needs adjustment.

Should everyone with IBS follow a low-FODMAP diet?

No. A short, structured low-FODMAP trial may help some people, but it should be followed by reintroduction and personalization. Long-term unnecessary restriction can reduce nutrition and food variety.

What testing is used for IBS?

There is no single test that confirms IBS. Clinicians use the symptom pattern, history, physical examination, and selected tests—such as blood or stool testing—when needed to evaluate other possible causes.

Can NaturoMedica help with IBS in the Seattle Eastside?

NaturoMedica’s Issaquah clinic serves patients from Sammamish, Bellevue, Redmond, Renton, Kirkland, and nearby communities. A naturopathic physician can review your history and coordinate nutrition, selected testing, and adjunctive services while referring for conventional evaluation when appropriate.

Related services

• Nutrition Counseling — Build a flexible food and symptom strategy without unnecessary long-term restriction.
• Functional Testing — Discuss whether a targeted lab or stool evaluation can answer a specific clinical question.
• Acupuncture & Chinese Medicine — Explore an adjunctive option for digestive discomfort, stress, pain, and whole-person support.

Medical information sources

This page is for education and does not replace medical advice, diagnosis, or treatment.

• NIDDK: Irritable Bowel Syndrome — Definition & Facts
• NIDDK: Diagnosis of Irritable Bowel Syndrome
• NIDDK: Treatment for Irritable Bowel Syndrome
• NICE: Irritable bowel syndrome in adults — diagnosis and management