Donne uses many metaphors

Donne uses many metaphors throughout the poem, most having to do with the flea itself. One example of this use of metaphor concerning the flea is the line in which he says, "This flea is you and I..." This method of using metaphors is what the entire poem is about. Without comparing the flea to such things as their marriage bed, this suitor would have no line for his lady at all. The metaphors add a comical aspect, for those who have a sense of humor, in that he is able to compare all of these complicated, universal concepts to a flea.
In conjunction with Donne’s use of metaphors, symbolism is equally important and equally abundant. The use of the flea as a symbol seems to be divided by the stanza...