Unlike malingering, there does not seem to be any clear secondary gain (e.g., money) in Munchausen syndrome.
Untangling the Web of Munchausen Syndrome, Munchausen by Proxy, Malingering, and Factitious Disorder.
He sailed back to Otranto in order to recover his health, but the new pope, Gregory IX., launched in hot anger the bolt of excommunication, in the belief that Frederick was malingering once more.