Page
Irritable Bowel Syndrome
K58 · Irritable bowel syndrome
Irritable Bowel Syndrome
A pattern of belly pain plus changing bowel habits, with normal-looking tests. The most commonly diagnosed DGBI in adults.
8.9%
of US adults meet Rome V criteria for IBS (2026)
Quick answer
IBS is a pattern, not a disease. Your gut and brain are real and the pain is real. The wiring between them just runs hot. Most people see their gut transit, bloating, and pain settle in 4 to 6 weeks once the pattern is named and the right inputs are in place.
Irritable bowel syndrome (IBS, ICD-10 K58) is a disorder of gut-brain interaction defined by recurrent abdominal pain on at least 3 days per month for the prior 3 months, paired with a change in stool form or frequency, with no structural or biochemical disease to explain it. Rome V (2026) revised adult prevalence upward to roughly 8.9% of US adults, nearly double the prior Rome IV estimate. The wiring between gut and brain runs hot; the tissue itself looks normal.
Patterns and subtypes
🔄
IBS-D
Diarrhea-dominant
Symptoms
- Loose, urgent stools
- Multiple bowel movements before noon
- Post-meal urgency
Triggers
- High FODMAP foods
- Stress
- Caffeine on empty stomach
🧱
IBS-C
Constipation-dominant
Symptoms
- Hard, infrequent stools
- Bloating that builds through the day
- Sense of incomplete evacuation
Triggers
- Low fiber, low water
- Skipped meals
- Long sitting
🔀
IBS-M
Mixed pattern
Symptoms
- Alternating diarrhea and constipation
- Unpredictable from week to week
- Cramping with both
Triggers
- Big meal swings
- Travel
- Hormonal cycles
🌫️
IBS-U
Unclassified
Symptoms
- Pain plus a changed bowel habit
- Pattern doesn't fit D, C, or M cleanly
- Often shifts over time
Triggers
- Hard to pin down
- Sleep loss
- Acute stress
What your doctor might miss
A normal scope doesn't rule out IBS.
A clean colonoscopy is meant to rule out damage. It does not rule out a DGBI like IBS. The pattern lives in signaling, not in tissue.
A 'sensitive stomach' is a clue, not a diagnosis.
When tests are normal and symptoms are real, doctors sometimes default to 'sensitive stomach.' Rome V calls the pattern by its real name. That changes the plan.
Food triggers aren't a food allergy.
IBS food triggers (like FODMAPs) are usually about poor absorption, not allergy. A clean reintroduction beats a long elimination.
Red flags
Urgent — ER now
- Blood in stool that is red or black
- Weight loss you didn't try for
- Fever with belly pain
- Night sweats
- Severe pain that wakes you from sleep
Needs evaluation
- New symptoms after age 50
- Family history of colon cancer or IBD
- Iron-deficiency anemia
- Persistent diarrhea over 4 weeks
- Symptoms after foreign travel
Mimics
- Inflammatory bowel disease — stool calprotectin and a scope distinguish.
- Celiac disease — a simple blood panel screens.
- SIBO — breath testing in select cases.
- Bile-acid malabsorption — empiric trial or specialty test.
The treatment ladder
01 · Track
Track.
One tap a day in MeNome. Foods, sleep, stress, and stool patterns. Two weeks of clean data beats a year of guessing.
02 · Adjust
Adjust.
Use the FODMAP Clean Test to spot true food triggers. Walk back the loud ones first. No 6-month elimination diets.
03 · Stabilize
Stabilize.
Hydration, regular meal timing, sleep before midnight. The boring inputs that move the system most.
04 · Support
Support.
Layer in MGB+ Clear (or Cool, for gut-side patterns). Real doses. Gut-brain pattern in mind.
See MGB+ Clear → →
IBS questions
Frequently asked
Is IBS in my head?
No. The signaling lives in real nerves between your gut and brain. The pain, bloating, and bowel changes are real. Rome V (2026) defines IBS as a disorder of gut-brain interaction, not a 'psychological' condition. Stress and sleep affect it because they affect the same nerves. They don't cause it.
What is the low-FODMAP diet, and should I do it?
FODMAPs are short-chain carbs that your gut doesn't absorb well. A short, clean elimination of high-FODMAP foods (2 to 4 weeks) helps you spot your own triggers. The 2026 guidelines move away from staying low-FODMAP forever. Eliminate, then reintroduce one food at a time.
How long until MGB+ Clear helps my IBS?
Most people see bloating and gut transit settle in week one or two. Magnesium and ginger work fastest. The deeper effects on pain and brain fog take longer. B1 and PEA work at the cell level, so plan on four to six weeks for a baseline shift you can describe in words.
Can I have IBS and another GI condition at the same time?
Yes. IBS often overlaps with functional dyspepsia, GERD, migraine, and pelvic pain. Up to a third of IBS patients also meet criteria for another DGBI. The MGB+ line is built so the formulas stack: Clear for the brain side, Cool for the gut side, Calm for the evening.
Do I need a colonoscopy before treating IBS?
Not always. The 2026 guidelines say a colonoscopy is needed only if you have alarm signs (blood in stool, weight loss, anemia, age over 50 with new symptoms, or family history of GI cancer). For typical IBS in younger adults without alarm signs, you can start treatment without a scope.
Does IBS go away?
IBS is usually a long-term pattern, but most people get long stretches of feeling normal. The goal isn't a cure. It's a steadier baseline, fewer flares, and a clear playbook when a flare hits. Many of our customers describe full weeks at a time without a flare after 8 to 12 weeks of pattern work.
What's the difference between IBS and SIBO?
SIBO (small intestine bacterial overgrowth) is one possible driver inside the IBS pattern. A breath test can flag it. Treatment is usually a 2-week antibiotic course followed by motility support. If your IBS-D pattern doesn't respond to standard moves, ask your GI about SIBO testing.
Related reading