It is a believed there is a genetic component to a variety of mental disorders such as anxiety, depression and schizophrenia.
Everyone's genetic make up is 99.9% the same. It is the 0.1% difference that produces the problems It possible but not necessary that you brother may have similar physical reactions. On the other hand he may not experience any GI symptoms at all.
While anxiety may be occur frequently with GI issues there is no evidence that it is the cause. It could be possible that both have similar underlying causes.
It is all very complicated and not really worth the effort looking for a cause. It is really worth the effort to seek out good IBS symptom management approaches.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS
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Re: Family predispositions...
It possible but not necessary that you brother may have similar physical reactions. On the other hand he may not experience any GI symptoms at all.
