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You stop being thirsty.
You stop being able to speak.
You stop being able to see.
You stop being able to hear.
You stop being able to feel touch.
Other side effects include shortness of breath, depression, anxiety, extreme fatigue, mental confusion (likely due to lack of oxygen), constipation or incontinence, and nausea. Your brain is basically slowly sacrificing less critical functions in order to perpetuate your survival. Even your skin will begin to show signs of your demise. It will get cold, turn a light bluish gray, and might even show signs of mottling.
Soon you’ll be too weak to cough or swallow, and your breathing will make a disturbing, guttural sound in the back of your throat called the “death rattle.” As far as doctors can tell, though, the death rattle doesn’t hurt—even if it sounds bad to everyone else. But doctors aren’t sure how much pain people actually feel as they die. Obviously, being burned alive or being shot are probably painful ways to go, but when you’re dying of natural causes in a hospital bed it’s hard to say. Your pain is usually being managed by healthcare professionals and you’ll likely lose consciousness in your final hours, so it’s likely very minimal.