I was playing tennis when my shoulder seemed to pop out of place. Now it's killing me. Did I dislocate it?
The answer is yes and no. In the technical sense, this doesn't sound like a dislocated shoulder, in the way people usually talk about dislocated shoulders. A complete shoulder dislocation would almost certainly include swelling, bruising, and the shoulder would appear deformed. It sounds as if you may have what is known as a subluxation, which means that your shoulder temporarily slipped out of joint, and then slipped back in. Or, it could be caused by shoulder instability. Shoulder instability essentially means that the tendons and ligaments which support your shoulder joint are loose or stretched. This can be an extremely painful condition, and you'll want to see a doctor as soon as possible. In the meantime, avoid using your shoulder as much as possible, and it wouldn't hurt to ice it either, as the pain is probably caused by inflammation, irritation, and swelling in the shoulder.