I have a sharp pain in my right arm pit. I feels like it is very deep in there, like muscle. My should is also sore, but I have had that for quite awhile and know that I will need to get it replaced. This pain is new and seems to worsen when I do a lot of movement with the arm and also feel some pulling pain in the neck. I have checked for lumps and due to an upcoming surgery a CBC had just been completed and all was normal.