The Question and Answer section for The Fault in Our Stars is a great resource to ask questions, find answers, and discuss the novel.
Hazel's father cautions Augustus that his daughter is still very sick and will be so for the rest of her life. He tells Augustus that although Hazel will want to keep up with him, the condition of her lungs will stop her.
Hazel has no illusions about her condition. From the beginning of the story she offers an honest and blunt narrative of her situation,
"Whenever you read a cancer booklet or website or whatever, they always list depression among the side...
Gus refers to his prosthetic leg as “old Prosty." He is a survivor of osteosarcoma.