So at work about a month ago (warehouse very physical job) I went to push a bunch of boxes that were on a conveyor and when I stretch my arm out to full extension I got this sharp almost burning pain in my upper neck it only lasts for 4 or 5 seconds then goes away but it happens everytime I extend my right arm out a certain way , the pain is in the middle of my neck but towards the left just a little . Again it's not a constant pain so nothing to go to a doctor over yet I don't think it does affect my job a little as I watch how I extend my arm because when it's the wrong way and that pain hits my neck it's bad . Just curious as what it could be as Google didn't come up with any answers .