Soft tissues are particularly vulnerable to radiation, and one of the ways radiation causes damage both by blowing holes in your DNA and other important molecular structures within cells. In the long term, this prevents cells from reproducing properly, therefore making healing impossible. In the short term, it kills a bunch of them. This causes a relatively rapid onset of symptoms. In lethal cases, they get progressively worse over time as the body cannot repair itself and slowly falls apart at a microscopic level, causing massive hemorrhaging and extreme pain.
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