I'm a 35 year old male in good health.  My right shoulder hurts me when I move it certain ways (I can't pinpoint the exact way to make it hurt, it just does).  It has been like this for a couple of years.  Doesn't affect my daily living, I can even play sports.  But the pain is always with me.  What is it?
Such type of pain usually is the beginning of arthritic change. Try hot fomenting after application of analgesic ointments and physiotherapy. If it doesn settle in 6 weeks get in touch with an orthopaedic with an MRI of shoulder.