Rotator cuff tendinitis, or tendonitis, occurs when the tendons and muscles that help move the shoulder joint are inflamed or irritated. It commonly occurs in people who play sports that frequently require extending the arm over the head. Most people with rotator cuff tendinitis can regain full function of the shoulder without any pain after treatment.

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The symptoms of rotator cuff tendinitis tend to get worse over time. Initial symptoms may be relieved with rest, but the symptoms can later become constant. Symptoms that go past the elbow usually indicate another problem.

Symptoms of rotator cuff tendinitis include:

• pain and swelling in the front of the shoulder and side of the arm

• pain triggered by raising or lowering the arm

• a clicking sound when raising the arm

• stiffness

• pain that causes you to wake from sleep

• pain when reaching behind the back

• a loss of mobility and strength in the affected arm