In my master thesis, I am trying to name the origins and signals of an actor`s fear. I have came from my own existing stage experiences previously and whilst studying classical acting at the Dramatic Faculty of the Academy of Performing Arts in Prague, and also from my first experiences with differing professional groups from theatres from around the Czech Republic. My thesis is supported by professional literature, with which one I have read during my studies at the Academy, and it is inspired by talks and by consultation with people who are active in an artistic field. In my work I reflect my mental prosesses, states and blocks, not only during stage creations, but also in my personal life. I think that a fear can rule an actor and cause stage fright. This is why I have decided to choose this subject for my thesis.