Shouting or screaming lines in theater is not recommended because it can be physically and emotionally taxing on the actor, resulting in vocal strain or injury. It can also be jarring for the audience and can come across as forced or insincere. Instead, actors are encouraged to use their voice and body to convey emotions and amplify their performance, without resorting to shouting or screaming. It is important for actors to focus on their vocal technique and projection in order to effectively communicate their character's emotions and story.
