Core Contents Media just announced that T-ara's Jiyeon has been hospitalized. 

The agency posted to its official Twitter on September 27: "[T-ARA] Firstly, thank you to the fans who attended the filming for 'Show! Music Core's Incheon airport festival special. Right before the 'Show! Music Core' recording today, T-ara member Jiyeon was unable to go on stage because of sudden, severe indigestion problems. Her condition wasn't good, so she wasn't able to join you all."

CCM added, "Jiyeon is currently at the hospital receiving treatment. We apologize for causing worry to the fans. She will try to recover completely, so she can show you a lively performance quickly."

Meanwhile, the September 27th installment of 'Show! Music Core' was canceled due to the '17th Asian Games Incheon 2014'. Get well soon, Jiyeon.

Source: allkpop