Computer Pain Right Shoulder I Have A Weird Pain Under My Left Shoulder Blade And To The Right Of It When I Move My Arm. What Is It?

I have a weird pain under my left shoulder blade and to the right of it when I move my arm. What is it? - computer pain right shoulder

The type of pain last night began random. For me, it feels a bit like a muscle? I am a swimmer, it sure helps. I find it odd that the pain started accidentally, when sitting at my desk. Do you think you should just rest and ice? Or it could be something serious? lol no, it is quite serious, however.