IBS is recognised by (nice) NHS &
National Institute of healthcare and excellence recognise hypnotherapy helps with his condition.

IBS is a common and uncomfortable disorder for people who suffer know the embarrassing and painful symptoms ranging from very very mild extremely severe.

Hypnotherapy is used to overcome these problems it’s a swift and gentle process giving IBS sufferers the freedom to feel comfortable in any situation.
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There are many articles for example :

This link also , please read