68-yo active male. Progressive pain in shoulder joint, sometimes sharp. Is there a simple procedure to reduce inflammation?

Consultation. The simplest treatment would be making an appointment with an orthopedic surgeon specializing in shoulders or sports medicine. You choices of possibilities are to large to discuss here.
What activities? What activities cause the shoulder to hurt? Often an initial small pain or injury can cause one 2 hold the shoulder in a guarded position. This position becomes the starting point for future movements which, because of the abnormal starting position, are abnormal in character, leading 2 more wear and tear. Rehab must focus on getting the sholdr muscles to work as a unit from proper start postn.