Pain is not the same as suffering.

Pain is objective - physical. Suffering is subjective - mental. Suffering is a result of us wishing the pain to end.

Proof?

[A true story!] Witold Pilecki was a Polish army officer, who sneaked into the Auschwitz by allowing himself to get arrested. Once there, he planned to organize with other Polish soldiers, coordinate a mutiny, and break out of the prison camp.

Even though Witold was in the same bad conditions (pain) as the other officers (and prisoners), he wasn't suffering. How come? He had a mission to complete!

So, any time you find yourself suffering, think about if the suffering you're experience can serve any purpose.

After all, such thinking is probably not unknown to you. You've probably gone through big hardships when we had a mission/ goal in mind. Do it again!