How does Hunger develop the theme of Alienation and Isolation?

Hunger by Knut Hamsun develops Alienation and Isolation across the chapters the companion marks for this theme.

The protagonist wanders through Christiania as a solitary figure, disconnected from others, finding only fleeting, often delusional connections, and feeling like an outcast in a city that ignores his suffering.

The narrator feels detached from society, wandering alone, interacting awkwardly with strangers, and experiencing a sense of being persecuted by the lame man's gaze.