The best I can do here is to give you a series of possibilities
You will need to see your physician to determine the cause
But since you do a physical job
this could be a result of heavy lifting
either a nerve problem in the neck (causing pain down your left arm)
or a more local nerve problem in the shoulder area
Are you taking any medicine for this? If so, does it help?
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doctors talk about a 'differential diagnosis' when considering an illness or complaint
this would be a list of possible causes
these lists can get kind of long
but here goes
Nerve problem either in the upper arm or neck with burning pain in your arm. Nerve pain is typically described as 'burning'
Thank you for your rating, but I was not finished talking with you so I will finish here.
The problem is with you that at 62 years other things can cause this type of pain, and while it is unlikely, your heart could be causing this if you have heart disease. Angina, pain from the heart getting too little oxygen, can cause pain radiating down the left arm. Again, this is unlikely, but this is the main reason checking with your doctor is so important.
Taking dangerous causes... angina in this case, off the list is critical, then your doctor can focus on the less worrisome causes mentioned above.
you may or may not need and Xray, but you certainly need a good exam. In the case of pain in your arm a lot can be gained from a simple physical exam.
Thanks for your question and good luck.