Your brain is capable of an immense amount of multitasking, but it still has its limits. The amount of sensory information coming from outside the body is already forcing your body to prioritize what’s important vs not. As mentioned by others, a lot of it is driven by how important it is for survival. Being able sense external things, like pain when cut, bad smells, or something dangerous coming into your field of view, is a lot more important than being able to feel your insides *unless there is an obvious cause for concern*. If your brain has to process and express every sensation, just existing will probably be difficult.
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