Aching arms?

I will pre-empt this question with pointing out the possibility that it may be that I've slept funny on my arm, but I'm not entirely certain, since it's not the first time!

Basically, I went for a run this morning, and all day today, my left arm/shoulder/elbow has been aching horrendously. It feels a bit like I've had an injection or blood test, and is suffering a bit, but is more uncomfortable than anything. I feel the need to constantly keep it moving, as if I'm lacking blood in my arm!

Any ideas on what might be causing this? I saw something on RW that mentioned that it might be through clenching my fist when getting tired in running - it seemed logical, but wasn't sure that it should be hurting for the rest of the day!

[Nevertoolate Graduate]

You could try this website to see if it gives advice

sportsinjuryclinic.net/spor...

I don't know what you have but it may be related to the way you hold your neck and shoulders. If you have a very locked neck during running this may act on the nerves radiating out and down the arms. Have you tried head and neck relaxing exercises?

Good luck.