I play vball.my shoulder has been hurting when i hit&serve and it was really sore after last practice.3 days later it hurt really bad.practice 2nite?

Bursitis?: In the absence of any trauma, and assuming this to be a new symptom, this could be a case of bursitis of the shoulder, an inflammatory process stemming from an episode of overuse of the joint. Put some heat on the shoulder (heating pad), 15 minutes at a time, thrice daily. May want to take it easy for the next few practices to let it heal.