Hidden lactose intolerance may be causing your IBS symptoms
NCT ID NCT06931379
First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study will test 70 people with IBS-related diarrhea to see how many actually have lactose intolerance. Researchers will use a PCR test and a symptom questionnaire to find links with age and gender. The goal is to better understand if lactose intolerance is a common, overlooked cause of chronic diarrhea.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this could help doctors better identify lactose intolerance as a hidden cause of chronic diarrhea in IBS patients.
- What could go wrong
- This is a small, early-stage observational study with only 70 participants, so results may not apply to everyone. It does not test any treatment.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 70 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jan 2026
An estimate. Start dates often move.
- Expected to finish
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Feb 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
Who is studied
The study population consists of adult patients aged 18-70 years diagnosed with chronic diarrhea lasting more than four weeks. Both male and female participants are included. Participants will be recruited from a single healthcare center. They will undergo comprehensive assessments, including demographic profiling, medical history review, and diagnostic testing for lactose intolerance using PCR. The diversity in age and gender ensures that potential correlations with these variables can be analyzed.
- Ages
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18 to 70 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * All Patients with IBS diarrhea dominant type meet Rome criteria attending at Al-Rajhy University Hospital during 6 months (from march to September). A patient must have recurrent abdominal pain (at least 1 day per week in the last 3 months) associated with at least two of the following: 1. Related to defecation (pain improves or worsens with bowel movements). 2. Change in stool frequency (diarrhea or constipation). 3. Change in stool form (appearance) (loose, watery, hard, or lumpy). * Patients aged \>18 years. * Both males and females Exclusion Criteria: * -patient aged\<18 years old. * Patients with chronic diarrhea don't meet Rome criteria * patients with malignancies
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The official record
The full official record for this study. This one lists no contact details, but it is the first place any would appear.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
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