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Hi Canadian - Frozen shoulder takes a while to develop, and comes after keeping the arm/shoulder immobile. If you've had these pains since getting the shot then it probably is not frozen shoulder. It sounds more like the type of muscle injury others have mentioned from the vaccine being administered improperly. You may want to contact the office where you received the shot. If several people had injections that were not administered properly they may be able to both confirm the cause and help you with treatment. I'm so sorry you're in so much pain, especially at this time of year. Pat