It depends on what caused the paralysis. If it was caused by brain damage, then the reason it can’t be cured is that the brain is very complicated, and we still don’t fully understand how it works. As brain research continues and our understanding increases, it is entirely possible that a way to fix the damage will be discovered.
If the paralysis is caused by nerve damage, then nerves will try to regrow and restore the lost nerves. There are treatments to help this, promoting nerve growth and making sure that they reconnect correctly. This doesn’t always work, and even if it does, the person may not recover fully.
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