Labral tears
It’s a very common thing to hear about pro athletes suffering from tears to the labrum, which is a thin rim of soft cartilage that surrounds the shoulder socket and maintains the shoulder stable, yet mobile.
However, these tears might happen in regular people, too. In fact, probably half of middle-aged men and women have had at some point some kind of labral tear.
What’s even more interesting is that you won’t notice you have one, as these tears are totally asymptomatic and they cause no problems whatsoever.
However, when you start moving, it might trigger shoulder pain, especially if you move your arm in an overhead motion or even across your chest.