My mother got vaccination 1st dose it's been more than 2 months now she is about to take the second one.. since her 1st dose of vaccination she's been having pain in her left arm ..the pain is irregular but  it's the same kind of pain she had in the first week after vaccination. Why does it still hurts? It's the left arm that she doesn't use much. Also she had a blood infection 2yrs ago which affected her kidneys.. thankfully the blood infection thing got recovered but she still take medicines for kidney Does this has to do with something with the pain in her arm? Or is it normal? Do i need to be concerned?