For years before he died my dad had awful osteoporosis and collapsed vertebrae, went from 6'2" to about 5'6", plus all the pain that comes with the changes in spine architecture-- nerve impingement, disk ruptures, sacroiliac dysfunction, hip pain ... you bet he had pain. But if you ever asked him, he would look at you and say, "It's just ... discomfort." It was his way of communicating that he wasn't willing to admit to having pain because that would indicate weakness. But he had awful pain, and took a lot of meds for it, and without them he would be completely immobilized and nonverbal (so he wouldn't cry out). And even then he would refuse to characterize his pain on a 1-10 scale, because that, too, would be to admit defeat.
There is no scale of "1-5/10 isn't really pain, it's discomfort." There is no "If the patient says it's discomfort, you don't have to do much about it." I know for a new nurse or a younger person it's hard to grasp the spectrum of human response to pain, but keep trying. And never accept "discomfort" when your patient can barely move or you know he has a condition that's painful, like bone mets or other orthopedic injury, peripheral neuropathy, other neurogenic pain, or ... whatever he says it is.