Jonathan Struggling with Shoulder Pain? It Could Be Bursitis. Shoulder bursitis occurs when the bursaa fluid filled sac that cushions your shoulder jointbecomes inflamed, leading to pain, swelling, and limited mobility. Common Bursitis Everest Regenerative Medicine Shoulder bursitis is a condition characterized by inflammation of the bursa, a small fluid filled sac that cushions the bones, tendons, and muscles near the shoulder joint. This inflammation can cause Intra Articular Injection Of Peptides For Joint Pain BPC 157 And TB 500 for Arthritis