How come even when a part of your body is missing (like my dad’s big toes), you can still feel “phantom pains” sometimes?

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How come even when a part of your body is missing (like my dad’s big toes), you can still feel “phantom pains” sometimes?

In: Biology

So nobody is entirely sure. There are a few theories though.

One theory is that the your brain does a check on your body and when it notices something wrong it causes pain to be with what used to be your arm for example.

Another theory is that say you lost an arm your brain re wires the nerves to a different area on your body say your calf. And when you calf is touched it thinks your arm was touched.