If you have IBD and your doctor keeps saying, “You’re in remission,” but you still feel flares sometimes, you are not crazy. You are not failing treatment. And you are definitely not alone.
Here’s the twist: sometimes what feels like an IBD flare is not IBD at all. It can be IBS living in the same neighborhood as IBD. Yes, they can coexist. And once you understand how, your symptoms start to make a lot more sense.
A quick story you might recognize
You’ve been doing everything right.
- You take your meds. Some of them have serious warnings.
- You show up for labs. You do the stool tests. You do the scopes.
- Your doctor says: “Your inflammation markers look great. Your IBD is quiet.”
Then, out of nowhere, your gut pulls a stunt:
- Cramping
- Urgency
- Bloating
- Diarrhea or constipation
- That familiar “uh-oh… is this starting again?” feeling
And your brain goes straight to: “My IBD is flaring.”
But what if your IBD is truly calm… and your gut is just still reactive?
IBD vs IBS: Same street, totally different problems
Let’s make this simple.
IBD is inflammation
IBD (Crohn’s disease and ulcerative colitis) means the immune system is causing real inflammation in the digestive tract. That inflammation can lead to ulcers, bleeding, weight loss, anemia, fevers, and damage seen on scopes and scans.
IBS is sensitivity and miscommunication
IBS (irritable bowel syndrome) is more about how the gut functions and feels. The bowel might look normal on a scope, but it can still cramp, spasm, bloat, and react strongly to stress, certain foods, hormones, and sleep changes.
Here’s the key: IBS can cause very real symptoms, even when there is no active inflammation.
The “Gut PTSD” effect: Why symptoms can linger after remission
This is one of the most important concepts I teach patients.
If your gut has been inflamed for months or years, it can become like a smoke alarm that’s too sensitive. Even when the fire is out, the alarm still screams when you make toast.
Here’s why that happens:
- Nerves get jumpy. Past inflammation can make gut nerves extra sensitive.
- Motility changes. The bowel’s movement patterns can stay irregular even after healing.
- The gut-brain connection stays on high alert. If you’ve had scary urgency, pain, or accidents, your brain learns to stay watchful. That can keep symptoms going.
- Scar tissue and “after-effects.” Some people with Crohn’s may have narrowing or stiffness from old injury. That is not always active inflammation, but it can still affect how you feel.
So yes, it’s possible to be in true IBD remission and still have IBS-type symptoms. Sometimes IBS was there first, and later IBD showed up. Other times, IBD came first, and after the inflammation healed, the gut stayed sensitive.
So how do we tell the difference between an IBD flare and IBS?
This part matters because it protects you from two big problems:
- Missing real inflammation (which needs IBD treatment)
- Over-treating when inflammation is not present (which can add risk without benefit)
Most of the time, we can get strong clues from simple tests.
Step 1: Clues from your symptoms (helpful, but not perfect)
- IBD flare is more likely if you have blood in stool (especially new), fevers, waking up at night to poop, ongoing weight loss, or symptoms that steadily worsen.
- IBS is more likely if symptoms come and go, are tied to stress or certain foods, improve after a bowel movement, and labs stay normal.
But symptoms alone can fool us. So we test.
Step 2: “Is there inflammation?” lab checks
- Fecal calprotectin (stool test):
- Think of this like a “gut inflammation smoke detector.” When it is elevated, it often means inflammation is active in the intestines.
- Think of this like a “gut inflammation smoke detector.” When it is elevated, it often means inflammation is active in the intestines.
- CRP (blood test):
- This is a general inflammation marker in the body. It can rise during IBD flares, but it can also be normal in some people even when IBD is active.
In plain terms: If calprotectin is low and CRP is normal, active IBD is less likely, and IBS becomes more likely. If they are elevated, we take a possible IBD flare seriously.
Step 3: Imaging when we need a deeper look
If symptoms point toward Crohn’s activity in the small bowel, we sometimes use:
- MR enterography
- CT enterography
These scans can help us look for inflammation, narrowing, or complications that a basic scope might miss.
Step 4: The “final judge” test when needed
Ileocolonoscopy (a colonoscopy that also looks at the end of the small intestine) can directly check the lining and take biopsies. We do not always need this for every symptom bump, especially if stool and blood markers already give a clear answer. But it’s there when we need certainty.
Okay, let’s say it’s IBS symptoms on top of IBD remission. Now what?
Here’s the good news: IBS can improve a lot. And the plan is not just “deal with it.” There are real tools.
I like to think of IBS care as a toolbox. You usually do best when you pick 2–4 tools that fit your symptoms, rather than trying everything at once.
The IBS Toolbox (for people with IBD in remission)
1) Reset the gut-brain reflex (this is real biology)
- Gut-directed CBT: helps retrain how the brain interprets gut signals and lowers the “false alarm” response.
- Gut-directed hypnotherapy: sounds strange until you see the data and results. It can calm gut sensitivity and reduce urgency and pain.
If you’ve ever thought, “My gut is anxious,” you’re not imagining it. The gut has its own nervous system, and it can be trained.
2) Food strategy (without turning your life into a diet prison)
- Low-FODMAP diet: can be very effective for gas, bloating, pain, and diarrhea in IBS. The key is doing it as a short-term trial, then reintroducing foods to find your personal triggers.
- Targeted adjustments: sometimes it’s not about everything, it’s about one thing (like lactose, certain sweeteners, or huge portions of raw veggies).
Important: If you have IBD, your nutrition matters. I prefer food changes that are structured and temporary, not extreme or endless.
3) Movement (yes, your colon notices)
- Daily walking helps gut movement and can reduce stress hormones.
- Strength training supports metabolism and overall health.
Even 10–20 minutes a day can help your gut behave more predictably.
4) Symptom-targeted medications and supplements
For cramping:
- Dicyclomine or similar antispasmodics can calm bowel spasms.
- Peppermint oil (enteric-coated) can relax smooth muscle and help pain and bloating for some people.
For diarrhea and urgency:
- Anti-diarrheal medications can be used carefully, especially for important events.
- Soluble fiber (like psyllium) can thicken stool and improve consistency.
For constipation:
- Soluble fiber plus hydration is a solid first step.
- Osmotic laxatives can help some people when used correctly.
- Prescription constipation meds may be appropriate depending on the pattern.
For chronic pain and sensitivity:
- Low-dose TCAs (tricyclic antidepressants) can reduce gut pain signaling. In IBS, we often use them for the gut, not for mood.
Which options fit you depends on your symptoms, your IBD history, and your safety profile. This is where your GI team helps tailor the plan.
A simple “Two-Lane Plan” you can use with your doctor
I teach patients to picture two lanes:
Lane 1: Inflammation lane (IBD)
When symptoms suggest inflammation, we check markers like fecal calprotectin and CRP, and sometimes imaging or colonoscopy.
Lane 2: Function lane (IBS)
When inflammation is quiet, we focus on the IBS toolbox: gut-brain therapy, smart food trials, exercise, and symptom-targeted treatments.
You are not being dismissed when your doctor says “remission.” Done right, remission is the goal. Then we treat what’s left, which is often IBS physiology after the storm.
When you should message or see your clinician sooner
Do not try to “push through” if you have:
- New or increasing blood in stool
- Fever or feeling systemically ill
- Unintentional weight loss
- Night-time diarrhea that wakes you up
- Severe, worsening pain
- Symptoms that are rapidly changing from your usual pattern
The takeaway
If you have IBD, remission is a win. But remission does not always mean your gut instantly becomes calm, quiet, and predictable.
Sometimes the inflammation is healed, and what remains is a sensitive, reactive gut. That can look like “flares,” even when your IBD is controlled.
The solution is not guessing. It’s a smart, step-by-step approach that separates:
- Active inflammation (IBD)
- Gut sensitivity and function problems (IBS)
Once you know which lane you’re in, you can choose the right tools and stop feeling like your body is betraying you.
You deserve clarity, not confusion.
Educational content only. This is not medical advice. Talk with your own clinician for personal care.
