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In the 27th year of King Zhao of Chu's reign, King Zhao observed strange celestial phenomena and consulted the Grand Historian of Chengzhou.
The Grand Historian advised him to perform sacrifices to remove the 'disease in his vitals' (腹心之疾). King Zhao disbelieved him.
He then stationed his troops at Chengfu, preparing to assist Chen, which was under attack by Wu. King Zhao suddenly fell ill, and his condition worsened day by day.
He still refused to perform the sacrifices until he eventually passed away from the illness.

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Open the tool →腹心之疾 (fù xīn zhī jí) is a Chinese idiom (chengyu) meaning “a serious hidden danger or deep-seated problem in a vital position”.
腹心之疾 is pronounced fù xīn zhī jí in Mandarin Chinese.
Literally, 腹心之疾 means “Disease in one's vital organs”. It is used to mean “a serious hidden danger or deep-seated problem in a vital position”.
腹心之疾 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
腹心:比喻要害处;疾:疾患。比喻要害处的祸患。