Demi Moore was rushed to the hospital last night ... and we're told the issue is substance abuse.
Law enforcement tells us a 911 call was placed at 10:45 PM Monday night. Paramedics responded to Demi's L.A. home and after assessing her for a half hour, she was transported to a local hospital.
Sources tell us she is being placed in a facility to "seek further professional assistance." Our sources say the treatment is for substance abuse.