Which condition is characterized by intentional setting of fires to relieve internal tension?

The condition characterized by the intentional setting of fires to relieve internal tension is pyromania. This impulse control disorder is defined by repeated episodes of deliberately firing, along with a fascination with fire and its contexts, and a sense of relief or pleasure derived from setting the fires. Individuals with pyromania often experience a buildup of tension prior to the act and a sense of gratification or release afterwards.

In contrast, obsessive-compulsive disorder (OCD) involves intrusive thoughts and compulsive behaviors but does not specifically include the act of starting fires for tension relief. Delayed gratification refers to the ability to resist immediate rewards for a larger reward later on and is not related to fire-setting behaviors. Antisocial behavior involves a pattern of disregard for the rights of others, but it does not specifically pertain to fire-setting or the internal emotional relief aspect associated with pyromania.