Are they already any known cases of health problems caused because of Second Life?

As with many (online) games, SL has had problems with players who become addicted. In SL these problems are worse than with other games as WoW. "All the people in Second Life are quite real and their emotions and motivations are quite real so in that way it's much more like socializing in the real world than it's is going into a game of World of Warcraft where it's an entire fantasy world that's quite well constructed and has a definite story line to it. In Second Life you're dealing with real people and real emotions." This makes SL a far more emotional and addicting experience.

Cases have been know of dying people after playing games like SL during longer periods.