Question
I have pain in my left are, from my elbow to my neck.  What can it be?

Answer
Hi Anna,

I will need more information to give you advice.

1.  How old are you?
2.  When did the pain starts?
3.  Did you fell on it or was it hit?  Trauma?
4.  What kind of pain is it?  sharp, dull, ache, shooting?
5.  When does the pain gets worse?  Movement of the elbow, shoulder?  During sleep at night?

I will be able to properly tell you more what is going on once I have more information.