Congrats on beating it, but some cancers can affect the brain and some organs which can be forever damaged or need to be removed etc.

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>When my Dad was very ill he confided in me that if he were in a full body cast with eczema and fell over a cliff to find himself perched on a ledge he would still rather live.

There are many examples of people wishing death compared to some conditions out there. Assisted suicide is a thing.