What is the main theme of Act 4 in Hamlet?

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kapokkid eNotes educator| Certified Educator

In contrast to the first three acts of the play, in Act IV the action comes hot and heavy as things really heat up and the major events of the play are set in motion, with Act V on the horizon to bring it all to a thundering close.

So the theme in some ways is action, it directly contrasts the complete inability of Hamlet to take any substantive action in the first three acts of the play as he works and works to try and find out whether or not his hunch is true and if he ought to act.  So much of what needs to be resolved to move forwards is resolved in Act IV, Hamlet's madness is revealed as false, his mother revealed as loyal to her son, Claudius as completely scheming and continuing his evil, etc.