Our expert says:
an outstrecth of the arm as you describe can certainly cause an injury to the structures around the shoulder especially the rotator cuff tendon. It may be a simple tendinitis or even a tear of the tendon. You may start with physio and if that does not help you should see a doctor versed in shoulder problems and he can confirm the diagnosis and sometimes a cortisone injection can give remarkable relief
Dr Joe de Beer
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