Letters of recommendation are ubiquitous in an academic research career. If. you teach one or more senior-level undergraduate courses or have undergraduate. students in your laboratory, you might have to write dozens of letters a year as. students become graduate-school bound or look for employment. If you do not.
Subacromial bursitis is a common cause of shoulder pain that is usually related to shoulder impingement of your bursa between your rotator cuff tendons and bone (acromion). Your subdeltoid bursa is less commonly inflamed shoulder bursa.
1 Bursitis: A bursa is a sac over the joints to provide a cushion to the joints and muscles. These bursae can become swollen, stiff, and painful after injuries.  Heart attacks: Although the problem is the heart, heart attacks can cause shoulder or neck pain, known as referred pain.