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Sore Arm from a Shot? Here’s What to Do

By: Meridith Dunford PT, MSPT, OCS, Cert. DN.

Arm soreness after a flu shot or COVID vaccine booster is a common but unpleasant side effect that usually lasts for a day or two. The pain in your arm is the immune system’s response to the vaccine, and that reaction includes inflammation involving redness, soreness, and swelling.

The site of injection is in the middle deltoid muscle of your arm, so one way to reduce this reaction is to move your arm around to keep the vaccine and its reaction from being concentrated in one location.

Studies exploring muscle activation with EMG (electromyograph) show that the best way to get your deltoid muscle moving to reduce soreness includes these five simple exercises listed below. So easy, you can do them in the privacy of your own home! (Refresh your screen if images do not appear.)

1. Lateral Deltoid Raises

Stand or sit with your palms facing down and raise your arms up with elbows straight working out to shoulder level.

2. Standing shoulder external rotation (90 degree abduction)

Standing with your arms out at shoulder level and elbows bent, rotate your hands up toward your head while keeping your elbows out at shoulder level.

3. Standing shoulder external rotation (arm at side)

Keep your elbow at your side with your thumb up and elbow bent so your forearm is parallel to the floor. Rotate the hand away from the stomach maintaining the forearm position and elbow in.

4. Overhead Press

Start with your hands in front of your chest and elbows bent. Press your arms up overhead straightening the elbows.

5. Horizontal abduction with external rotation

Repetition throughout the day is important, so try to pick a few of the motions that work for you and perform up to 20 reps, as often as every hour, for the first day to help disperse the vaccine and reduce local muscle soreness. Performing exercises into the next day is also suggested if soreness continues. You can stop when the soreness has ceased.

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Sore Arm from a Shot? Here’s What to Do

Arm soreness after a flu shot or vaccine is a common side effect that can make movement uncomfortable. Learn simple exercises that may help reduce the pain and speed up recovery.

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