I've been having this pain in my right shoulder for a few months now, its usually just a dull ache when I'm resting but it becomes sharper when I move my arm a certain way, when I lift something heavy or when I tug on something. Recent examples have been when I'm saddling a horse or when I'm controlling a horse using arm strength. It hurts the most when I'm leading a horse from the ground. Most of the time its not super bad, and I can function normally with it, but there are sometimes when it really bothers me. I can't pinpoint a specific time it started. It doesn't hurt when I put pressure on it and it only sometimes hurts when I move it. No other part of my body hurts and I don't recall injuring my shoulder at all.