Hi. how long is temporary? my mother started experiencing severe pain and retricted movement in left arm after flu jab. 7 weeks later no improvement

Too long: Should have been sore 1-2 days. See your GP.

Injury: If pain and/ or marked tenderness persist at the injection site, some nerve or muscle injury may have occured or else some other coincidental problem like tendonitis may now be present. I recommend an examination of the arm by a physician for evaluation of pain and limitation of motion.

See doctor asap : Very rare to have a major issue after the flu vaccine but your symptoms warrant an Eval asap to rule out other issues