Originally posted by: Uchiha Barles
I'm kind of agreeing with sigma here. Genjustsu will never do anything like cut off a leg, or put a bullet in a brain. But the thing that causes the damage is the way the body reacts to it. The biochemistry involved becomes disrupted, and that's what kills. I think that, if you can trick the mind into responding to the genjutsu in that manner, then you really could take someones life with it, or paralyses them. If any damage were caused, it would be limited to neurological damage because genjutsu affects the brain. No matter how hard you try, you'll never cause any damage to a door knob with genjutsu (no brain), that's for sure.
The indication of that being true is when Itachi said that the pain was not fake. I take that to mean that his body chemistry was reacting as if there were stab wounds. Not everything, just the nervous and endocrine systems (he should have been spewing adrenaline like crazy. In fact...that might have been the cause of his physical exhaution.)
Another way that genjutsu might work to cause actual damage, is to scare the living shit out of someone. Specially old people. If you make something sufficiently frightning, you might be able to cause that person to have a heart attack...like giving a surprise party to your 100 yr old grandmother...
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