King's official website says he fell ill Friday evening during a performance at the House of Blues in Chicago and was evaluated by a doctor.
The end of his tour was to include stops next week at his own B.B. King Blues Club and Grill in New York.
The Rock and Roll Hall of Famer is 89 and has released over 50 albums.
No further updates on his condition were provided.
Earlier this year, King issued a public apology to fans after an erratic performance in St. Louis led to audience catcalls and early departures. His publicists called it "a bad night for one of America's living blues legends."
You can visit this real legend or Icon website http://www.bbking.com/ at 89 years old and performing for the last 73 years this is a Legend or Icon in the games. Artists today need to understand what that word means for real. You are not a Icon or Legend until you achieve many goals in this industry. And I mean real goals of achievement.
Get Well Soon Riley B King aka BB King because we all know our people really don;t support your shows and that is reason why we are stuck today.