Paris' Medical Condition -- Mental, Not Physical

Law enforcement sources tell TMZ Paris Hilton's medical condition was purely psychological and that she was in peril of having a nervous breakdown, and that's why she was released early this morning.

Psychiatrist Charles Sophy visited Hilton in jail yesterday and the day before. We're told after Sophy's visit yesterday, word was passed to the Sheriff that Hilton's mental state was fragile and she was at risk.

The reason for releasing her had nothing to do with a rash or other physical issues. It was purely in her head.

Last month, on the eve of a trial in which Hilton was accused of slandering socialite Zeta Graff, Dr. Sophy told the judge that Hilton was "emotionally distraught and traumatized" over her jail sentence, which prevented her from participating in a meaningful defense. That trial was put on hold until August.

UPDATE: Law enforcement sources have just told TMZ the County Jail medical team made the final decision to spring Paris based on Dr. Sophy's psychological evaluation. And we're told, Sheriff Lee Baca gave the final approval.