Studies show that exercising before an injury has healed may not only worsen it, but may greatly increase the chance for reinjury. Put the arm with the injured shoulder in a sling when you take the person to the doctor. Acetaminophen eases muscle soreness but does not help with inflammation. While the pain could linger for weeks, with the proper and immediate treatment, it usually disappears in a few days. R - Rest the injured shoulder.
Rest prevents further inflammation, giving the tendon a chance to heal.
Resume your activities only after the pain is completely gone. I - Ice the injured area as soon as possible. Immediately putting ice on the injury helps to speed recovery because it not only relieves pain, but also slows blood flow, reducing internal bleeding and swelling. Put ice cubes or crushed ice in a heavy plastic bag with a little water. You can also use a bag of frozen vegetables.