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I, too, experienced arm pain, then shoulder pain after my first ever flu shot. The pain started as a dull ache at the site of injection which worsened over the next few weeks. It then spread to my shoulder and after eight weeks, I was diagnosed with rotator cuff tendonitis. I did not injure my shoulder, nor have I ever had this type of problem before. I saw a physician at a Sports Medicine Clinic who informed me that he was surprised at the number of similar injuries he has seen after receiving the flu shot.