Its like tendonitis of the shoulder. The bursa is a little sac full of fluid and i gues when it gets irritated, its called bursitis. It happened at volleyball practice the other day. I went up for a spike and felt some sort of pop sensation. I've been feeling slight pain ever since. I looked it up online and found out what it might be. They said that it is usually treated by simply taking anti inflammatory medication for an extended period of time. Oh well... I'll get a doctor to check it out just in case. anyone else ever had bursitis?