When Bowel Habits Change but Tests Are Normal

The Tummy Clinic | December 1st, 2025

When Bowel Habits Change but Tests Are Normal: What’s Really Happening

If your bowel habits have changed but your tests are “normal,” it can feel confusing — even frightening.

But for IBS and other DGBIs, normal tests are expected.

Symptoms come from function, not structure.

Tests Look at Structure — Not Communication

Medical tests check for:

  • inflammation
  • obstruction
  • infection
  • cancer
  • structural damage

They cannot see:

  • motility changes
  • sensory hypersensitivity
  • gut–brain miscommunication
  • stress physiology
  • abdominal wall tension
  • autonomic imbalance
  • nervous system overload

THIS is where IBS lives.

Why Symptoms Still Feel So Real

Because IBS arises from:

  • altered gut signalling
  • amplified sensory pathways
  • disrupted motility
  • reactive stress responses
  • physical tension
  • nervous system fatigue

You can feel very unwell even with pristine imaging.

The Emotional Impact of “Normal Tests”

Many patients think:

  • “Did they miss something?”
  • “Why do I still feel terrible?”
  • “Is this in my head?”

No.
Your symptoms are real — they come from a sensitive system that imaging cannot see.

This is good news.
It means nothing dangerous is happening.

How TTC Helps When Tests Are Normal

We look at:

  • patterns
  • timing
  • triggers
  • load
  • motility rhythm
  • sensitivity levels
  • stress physiology

Tests tell us what’s not happening.
Your story tells us what is happening.

And that’s how we build the right plan.

Frequently Asked Questions

Managing IBS with diarrhea can be challenging, but making the right food choices can help. Here’s what works for many people with IBS:

  • Low FODMAP diet: This dietary approach helps reduce symptoms like diarrhea, bloating, and stomach pain. It involves removing certain foods and gradually reintroducing them to see which ones trigger your symptoms.
  • Easy-to-digest foods: Stick with foods like plain rice, cooked carrots, zucchini, and lean proteins (e.g., chicken, fish) to ease digestion.
  • Avoiding triggers: Steer clear of fatty, spicy, or fried foods, as well as dairy and caffeine. These can worsen symptoms for many people with IBS.

If you’re unsure which foods work for you, consulting with a healthcare provider can help you create a personalized meal plan.

Bloating, gas, and stomach pain are common in IBS. These symptoms often result from:

  • Gas buildup: Undigested food or fermentation in the intestines can cause gas and bloating.
  • Gut motility issues: In IBS, food may move too quickly or slowly through the digestive tract, leading to discomfort.
  • Food sensitivities: Certain foods like high FODMAP foods can cause bloating or pain.

Managing these symptoms typically involves diet modifications, stress management, and finding the foods that work best for your body.

IBS constipation can be tough, but there are ways to improve bowel movements:

  • Increase soluble fiber: Foods like oats, bananas, and carrots can help soften stool.
  • Stay hydrated: Drinking plenty of water helps keep things moving.
  • Exercise regularly: Physical activity helps stimulate digestion.

If these strategies don’t work, gentle laxatives or stool softeners might be considered, but always under the guidance of a healthcare professional.

Certain foods can make IBS symptoms worse, including:

  • High FODMAP foods: These include foods like onions, garlic, certain fruits (e.g., apples, watermelon), and dairy.
  • Fatty foods: Rich, greasy foods often cause discomfort for those with IBS.
  • Caffeine and alcohol: These can irritate the digestive system and increase symptoms like diarrhea or bloating.

By tracking your food intake and symptoms, you can start to identify which foods are causing flare-ups and work toward a personalized plan.

Constant constipation in IBS can be caused by:

  • Low fiber intake
  • Dehydration: Not drinking enough water can make stool hard and difficult to pass.
  • Stress: Emotional stress often affects digestion and can contribute to constipation.

If constipation persists despite lifestyle changes, consider speaking with a healthcare provider for further assessment and potential treatment options.

Severe bloating can occur when:

  • Gas is trapped in the intestines due to difficulty digesting certain foods or fermentation.
  • Slow motility: In IBS, the digestive system may move food too slowly, leading to bloating.

To manage bloating, consider reducing high FODMAP foods and incorporating more digestive-friendly meals. Stress management techniques like yoga or mindfulness can also help reduce bloating by calming the nervous system.