Talk:Spirit Physiology/@comment-26119709-20170523233051/@comment-24053170-20170524000103

Spirits who die in the soul society are reincarnated back into the living world, this is explained a few times throughout the series.

Only spirits or souls killed by Quincy are permanently destroyed(which explains why we never see any former quincy spirits in the soul society, as they apparently don't reincarnate there, unless of course they end up in Hell, which is also likely)