A thorn in your side: a metaphor for the person or thing you hate most: if you want world peace, you should pull out the thorn in your side.
A thorn in the flesh: A thorn in the flesh is intolerable. Metaphor is something that is extremely annoying and eager to get rid of. Often used with "an eyesore".
Ouyang Xiu's History of the New Five Dynasties.
According to the book, at the end of the Tang Dynasty, there was an envoy named Zhao, who was arrogant and arrogant by virtue of his royal family. The people hate this unfairly, but they are afraid of his power and dare to speak out. Later, Zhao was transferred to another post. After hearing the news, people were very happy and rushed to tell each other, saying, "This is great for us. The nail in our eye has been pulled out. " Later, "eyesore" was often written as "eyesore, thorn in the flesh" to describe each other's disagreement. Example of usage: No.3 is sandwiched between Qian's family and Qi's family and is a thorn in the side of the old man.