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I'm training for the London Marathon and have recently been experiencing pain in my left arm when running. I ran 18 miles with a lucozade bottle in the same hand for the whole distance and its now been 2 weeks and I haven't been able to shake off the pain. It feels like a dull ache in the outside of my upper bicep and a slight pain in my shoulder. I've been on a few short runs since the 18 mile and if i straighten my arm out and shake it about a bit then the pain subsides for a minute or so but then reoccurs. Any advice? Many thanks.