Final Diagnosis

Final Diagnosis is a 1997 science fiction novel by Northern Irish author James White, part of his Sector General series.

A man suffering from multiple mysterious illnesses and allergic reactions is labelled a hypochondriac.

He befriends his fellow alien patients, telling them his life history.

Rather than dismissing his complaints, the attentive hospital doctors develop a theory, and bring him back to his home planet.

At the scene of a childhood accident that seems to have started it all, explanations are found.