Hi and welcome to HCM.
It doesnt sounds serious and many people experience this,especially those who exercise. It is most commonly just a temporary nerve
or vascuar compression in thoracic outlet(shoulder and clavicle
There can be muscle swelling or hypertrophy which compress vascular and nerve structures. You should rst if you feel such pain till it stops. YOu mustnt force yourself. All this i ve mentioned can be evaluated by ultarsounds and xray examination.SO I suggest to do it. Wish you good health.