https://www.healthcentral.com/article/few-started-experiencing-aching-pains-right-arm-extending-shoulder-around-back-shoulder-blade-sometimes-arm-pit-idea-what-be
GERD

A Few Days Ago I Started Experiencing Aching Pains In My Right Arm Extending To My Shoulder And Around To The Back Of My Shoulder Blade And Sometimes Under My Arm Pit. Any Idea What It Could Be?

    Answered by Amy Tudor
    You should know: The answer above provides general health information that is not intended to replace medical advice or treatment recommendations from a qualified healthcare professional.