In Norman Mailer's "An American Dream," the protagonist experiences a profound inner turmoil symbolized by the image of a fire spreading within him. This fire signifies intense emotions or thoughts, creating a sense of urgency and pressure that builds up internally. The description conveys a visceral sensation, suggesting a struggle between his desires and the reality he faces.

The reference to dry lungs and a heart on the verge of exploding highlights the physical manifestations of this emotional crisis. It paints a picture of someone trapped in their feelings, striving for release. This passage captures the essence of the internal conflict that defines the character's journey throughout the novel.