A persistent psychic drive to act that is not relieved until the action is taken. Clear consciousness of the proposed act followed by an agonizing struggle, defeat, and sense of relief following the act are characteristics of impulsions, obsessions, and inhibitions. Impulsions may include folie du doute or doubting mania (e.g., repeatedly checking to determine whether something has been done); obsessive fears of contact or delirium of touch; agoraphobia; dipsomania; pyromania; kleptomania; homicidal or suicidal impulsion; onomatomania; arithmomania; exhibitionism.