T1 diabetics often get a condition called adhesive capulitus (frozen shoulder) which starts slowly with numbness & soreness often felt up and down the entire arm, neck, and shoulder and eventually limits movement of the arm. While it can go away spontaniously, if you do not seek treatment you can end up with loss of muscle tissue caused by not using muscles over time. It can strike one or both shoulders and it can come back again - I’ve had it twice now. Your GP can easily diagnose the condition just by feeling for the adhesive tissue.
