system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it so hard for the body to fight off cancer?

If cancer is composed of our own cells, then why can't the body just kill it off with ease? (Probably easily answered and I'm just uneducated but still)
gpt
>why can't the body just kill it off with ease? 

Your body isn't designed to fight with itself. It does have mechanisms for cells to kill themselves, for instance If the cell's DNA is damaged. Cancer is a result of those mechanisms failing.