I have been in hospital recently and I had a cannula in my left arm for two days. If I hold my arm out, palm up, I have a swelling just above the crease of my elbow and it is sore. Could this be anything to do with the fact that i had a cannula inserted in hospital or, alternatively is it some kind of infection due to the fact that I have not been well all week. I have had aches and pains as if I were starting with flu all week.