Jesse Jackson hospitalized with stomach pains

CHICAGO, Illinois (CNN) - The Rev. Jesse Jackson has been hospitalized after complaining of stomach pains, a spokeswoman for Northwestern Memorial Hospital said Thursday.

Hospital representative Latoya Porter said Jackson admitted himself around 3 p.m. CT on Wednesday.  She did not have an update on his condition but said he was having tests Thursday morning.

Jackson, 66, a long-time civil rights activist, had been in Atlanta, Georgia, working on behalf of the presidential campaign of Sen. Barack Obama.