To think of this another way (intentionally pretty different from the others, which I do not disagree with) there are dozens of ways you should be dying every day (acidosis, asphyxiation, hyperglycemia, hypoglycemia, fungal infection, heart arrhythmia, ammonia poisoning, urea poisoning, the list goes on) and every day your organs work biochemical magic to stave off all those deaths, and all those things kill you in different ways.
Life-threatening diseases cause one or more of your organs to malfunction and that means one of the above deaths starts to close its bony fingers around you. Just like getting shot and strangled feel different to you, asphyxiation and ammonia poisoning and the others also feel different, i.e. present different symptoms.
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