I have a reoccurance of Base of Tongue cancer, and this is a dehumanizing sort

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I have a reoccurance of Base of Tongue cancer, and this is a dehumanizing sort of cancer in that it starts to strip away some our most basic asthetic appreciations: eating food, tasting, swallowing, speaking and sexual intimacy. It is also dreadfully painful. So - I've been having the internal question of, when is enough enough, and I think there was a classical parable of how someone would choose their death.