7.Tendon Tear
It can happen slowly over time or suddenly — after a turn or twist — usually in the tendons of your rotator cuff or biceps. It hurts and keeps you from moving your shoulder easily. If it tears completely, your muscle can pull away from your bone, and it can take a long time to heal. Depending on your age and severity of the injury, your shoulder might improve with time and treatments suggested by your doctor. However, some tendon tears might not improve without surgery.
8.Instability
A sudden blow or long-term wear can work the tip of your upper arm bone either partly or all the way out of your shoulder socket. You might know it as a dislocated shoulder. It can tear ligaments, tendons, and muscles, which makes it more likely to happen again. It can cause pain and unsteadiness when you raise your arm, and you may have arthritis there later.
