Why does diarrhea in children cause persistent and chronic diarrhea?

The causes are more complicated, such as general infection, immune deficiency, enzyme deficiency, and malnutrition, which can all cause prolonged diarrhea and lead to protracted or chronic diarrhea. Of course, the most important one is acute diarrhea, which is not thoroughly treated or not treated properly, so it leads to prolonged course and becomes protracted diarrhea. Therefore, not all healthy children are prone to protracted or chronic diarrhea, but it is possible. The second child's duodenal mucosa and jejunal mucosa are also atrophic, so the villi of the small intestine are easy to fall off, which leads to a great impact on the absorption of nutrients in the small intestine. The third is that because there is a long-term use of broad-spectrum antibiotics, it will definitely lead to a disorder of the intestinal flora and a reduction of normal intestinal bacteria. Another reason is that if a child is severely malnourished, he usually has a defect in intestinal motility. Finally, because these malnourished children are malnourished in many things, they lack many nutrients, and their immune function will be affected to a certain extent, so their sensitivity to pathogens will increase, and their tolerance to food antigens will decrease. Children with severe malnutrition are prone to diarrhea, and once they have diarrhea, it is easy to become protracted, and diarrhea further aggravates their malnutrition. Then there is an increase in intestinal and extraintestinal infections, forming a vicious cycle, so this cycle cannot be broken, which will lead to the decline of various organ functions. Therefore, it is more difficult to treat patients like this, and their recovery is sometimes poor.