Now, this is a touchy subject, indeed, for it's only something I've genuinely experienced recently with a particular insight: our suffering is the same suffering as the suffering of Christ in His Passion.
There's some kind of metaphysical reality to this: "Christ's Passion" is, at least from our mystical perspective, an on-going, enduring, ever-present happening (not unlike the Holy Eucharist, the Resurrection, and so on).
But the real mind-blower is the discovery that the suffering is the same either way; we never suffer alone or in silence, but Christ suffers with us.
I confess: I don't understand all of the metaphysics behind this or why this is the case, only that it is the case.
And the truth is there comes a point where suffering is just too much to bear, and it's very unlikely we'll have the presence of mind to be able to offer such hardship to Christ.
But the minor things, the minor pains, the minor suffering, the suffering that uncomfortable but leaves us with presence of mind...this must be always offered to Christ. Or rather, we must remember that the suffering happens at once to us and to Christ as well.
A profound but powerful mystery.