腹心之患

Explanation: Analogy serious scourge. 　　Source: Sima Guang Song, "Mirror of the first year after the Liang Taizu dry" the border of the cloud generation and Yan, Shu Biruo disturbing my city, shake the human, I _set_ off thousands of miles, difficult priorities should be, which is also the hinterland of the patients also. " 　　Examples: Southeast again with a more, for ~. ★ Ming Liu Ji "Annals of Ming Jing Wu Ying in more income into the Association of marquises of Jin Wu and Wu, Huang-Chi Wu in more income"