Gregor Samsa is the sole source on income for his family. Paying for the sins of his father, he must work every day and is under appreciated. Is it any wonder that he already feels subhuman and lonely before his metamorphosis? Just like in The Yellow Wallpaper, his isolation leads to his deterioration and vice-versa. His form disgusts and revolts his family. They lock him away in a room where he rots. He is stuck in that room with only his thoughts, the only real human part of him. The deterioration is of his body, not his mind like the protagonist in The Yellow Wallpaper, but the psychological effects of being isolated and alone are all to present throughout the novella. By the end of the story, he is withered and broken down. His family wants nothing to do with him, so he dies a pitiful death on the floor of his room. What led to his death? The deterioration of his body and his pitiful existence are good guesses, but that is besides the point. The themes are true to everyday life. When someone feels alone and actually try to isolate themselves, they feel subpar, like Gregor does. His transformation, whether literal or metaphorical, impacts his life in a huge way. His isolation was further perpetuated by the way that his family acted. They were literally revolted by Gregor. They ended up seeing him as a burden, and such he stayed away and wasted in his room. The deterioration of his body was caused by the harassment and isolation put upon him by his family.