Caroline, what kind of beans are you eating?

Some but not all beans are rich in exogenous lectins - while I doubt that they can enter your blood from your GI tract, potentially leading to systemic effects, if they are not denatured before eating the beans this can lead to unpleasant local GI tract symptoms.

It depends on the kind of bean but usually soaking them overnight and then cooking them well is sufficient to get rid of the exogenous lectins.