There are a lot of nerves and blood vessels that pass through the front of your shoulder. When this area gets compressed or inflamed, you could feel a variety of confusing symptoms in your shoulder and arm. Doing the right stretches Can give you relief.
Stretching out the front of your shoulder and across your chest will help to open up the area that the nerves pass through. My favorite stretch for this the doorway stretch because it’s so convenient to do. I also like to lay on a long foam roller so that my spine runs along the roll, then drape my arms out to the side and ‘make snow angels’. Whatever it takes to feel that stretch across the front of your chest, and you need to do it frequently (>3times/day).