One of the causes of this impingement include: Your bursa is irritated and inflamed. Your bursa is the fluid-filled sac between your tendon and the acromion. Your bursa helps your muscles and tendons glide over your bones. Your bursa can become inflamed due to an injury or overuse of the shoulder. Contact Advanced Health Solutions – GA Spine & Disc now at (770) 926-9495 for proper medical evaluation and treatment.