Must a girl suffering from chronic flatulence inform a suitor of her condition, and is it permissible to conceal the matter from him if he is pious and she fears his rejection?

Flatulence is not among the ailments that prevent the intended purposes of marriage, which are love, mercy, and procreation. Nor is the girl obligated to inform her suitor of it, especially if doing so might lead to the dissolution of the engagement.