This is an ancient concept: suffering is pain multiplied by resistance.
What this means is that the more we resist pain, the more suffering we endure.
The belief behind this is that pain in Life is inevitable. But suffering is an option.
Of course you can think of things you do to avoid unnecessary pain. But, what about necessary pain? It is in these times, when pain is necessary, that we need to allow it to work its purpose, or else we experience a suffering that comes from nonacceptance.