What are the signs of shoulder instability?
The main sign is pain in your shoulder. The pain can start suddenly or slowly. It may hit you just as you throw a ball, for example. If the injury happens suddenly, you may also feel numb all the way down your arm.
If shoulder instability comes on slowly over time, you may only notice pain at certain times. Shoulder motions like throwing may hurt, but the pain isn't as bad as the pain of a sudden injury. Your shoulder might be sore when you move it. It might feel loose in its joint. Your arm might feel weak.
Written by familydoctor.org editorial staff