When someone has an autoimmune disease, their brain is sending electrical waves to tell the immune system to attack what it believes to be bad cells. So why can’t you just tell your brain to stop sending those messages, since it’s the one sending them in the first place?
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Your body has a just unbelievable amount of foreign stuff in it. Your immune system could not handle attacking it all. You are perpetually overrun with outside things. Your immune system has to act selectively. To do this your body creates antibodies, which are designed to attach only to specific organisms, and your immune system has standing orders to obliterate anything and everything with an antibody attached to it. When a bacteria/virus enters your body, it just hangs out until it causes problems, and your body figures out that the problems are from this virus/bacteria, and then it designs antibodies and releases them across your body.
Several of these steps function outside of your nervous system. If any part of this doesn’t work right, there isn’t a lot your brain can do about it. Like if your white blood cells thing they see antibodies (when there aren’t any) and attack, your brain can’t stop it.
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