Grounds for annulment vary slightly from state to state. Generally, they may be obtained for one of the following reasons:
misrepresentation or fraud -- for example, a spouse lied about the capacity to have children, stated that she had reached the age of consent or failed to say that she was still married to someone else
concealment -- for example, concealing an addiction to alcohol or drugs, conviction of a felony, children from a prior relationship, a sexually transmitted disease or impotency
refusal or inability to consummate the marriage -- that is, refusal or inability of a spouse to have sexual intercourse with the other spouse, or
misunderstanding -- for example, one person wanted children and the other did not.