Search in Baidu will get these answers from netizens: 1, green also means black. 2. As the saying goes, I completely regret it! Only when you die will your intestines turn black. As the saying goes, if you are blue and regret it, you will regret it. When people are in trouble, their skin is wrinkled and darker than usual, commonly known as blue and purple. The intestines are regretful. It is an exaggeration to say that the color of the face extends to the belly. Use very, very regret to describe it. Second, some people say they regret it. When people die, their intestines are green. I think maybe ancient people are gossiping, too. A celebrity or a senior official accidentally said such a thing, and others followed suit. Well, what celebrities say is considered different from ordinary people. Maybe in the theory of traditional Chinese medicine, if you regret it, you will get angry. When you are angry, you will be depressed. When you are depressed, your blood will stagnate and your blood will turn blue. Then why are your intestines green? I think 1. When I am angry, we all talk about stomachache. What's in my belly? Intestines! So I suspect that the blood in the intestine is stagnant. 2. Qi originates from the lung, and the lung and large intestine are from the outside to the inside, so it is still suspected that the intestine is green. That's all I can think of.