Is this the same as the IBS-SSS?

No. The Thesos IBS Impact Score is an original questionnaire with its own questions and scoring. It is not a clinical severity scale.

What is a 'good' score?

Lower means you reported less impact. There are no medical cut-offs. It's most useful for seeing how your own score changes over time.

Why does food freedom count?

Many people with IBS describe avoiding foods and worrying about eating out as one of the biggest effects on their life, so it gets its own area.

Free Thesos tool · Piece: Impact

Check Your IBS Impact

See which parts of life IBS is taking the most from—food freedom, confidence, travel and more.

~3 min A 0–100 score across five areas of life

Your answers are not saved to your Thesos account unless you choose to save them. Educational, not a diagnosis.

About this tool, FAQ and sources

How much is IBS really affecting your life? Answer 10 short questions to get your Thesos IBS Impact Score from 0 to 100, broken down across physical symptoms, unpredictability, food freedom, daily life and mental load.

How it works

There are five areas, each with two questions about the last two weeks. Each answer scores 0–4, so each area is worth up to 20 points and the total is out of 100. All areas count equally. Higher scores mean you reported a greater impact from IBS within this questionnaire.

It can

Show which parts of life IBS affects most for you right now
Give you a simple number to compare against later
Help you explain the impact to a clinician

It cannot

Diagnose IBS or any other condition
Classify your IBS as mild, moderate or severe
Compare you with other people; it is not clinically validated

Questions

Is this the same as the IBS-SSS?: No. The Thesos IBS Impact Score is an original questionnaire with its own questions and scoring. It is not a clinical severity scale.
What is a 'good' score?: Lower means you reported less impact. There are no medical cut-offs. It's most useful for seeing how your own score changes over time.
Why does food freedom count?: Many people with IBS describe avoiding foods and worrying about eating out as one of the biggest effects on their life, so it gets its own area.

Method and sources

Original Thesos questionnaire, scoring version 1.0: 10 items, five equally weighted domains of 20 points. The scoring will not be changed without publishing a new version number. It is not a clinically validated severity scale.

Irritable Bowel Syndrome (IBS) · NIDDK, U.S. National Institutes of Health
Treatment for IBS · NIDDK
Irritable bowel syndrome (IBS) · NHS (UK)

Evidence sources last reviewed: 15 October 2026Last updated: 15 October 2026

For education and self-management only. Not a diagnosis. In an emergency, call your local emergency number.