Ald. JoAnn Thompson

Ald. JoAnn Thompson (16th) at a City Council meeting on Oct. 5, 2011. (E. Jason Wambsgans, Chicago Tribune / July 29, 2012)

A Chicago alderman is in the hospital Monday morning, after she collapsed in Englewood.

Ald. Joann Thompson, Ward 16, was attending a two-day music festival in her name, when she suddenly passed out, just before 8 p.m. Sunday.

She’s being treated at Rush University Medical Center.

There’s no word on the cause of her collapse but hospital officials she's in stable condition.