If you encounter diarrhea while writing a novel, you can consider the following methods: 1. Description of the feeling of diarrhea: In the novel, describe the feeling of diarrhea such as discomfort, nausea, weakness, etc. This way, the readers could better feel the discomfort and pain of the protagonist. 2. Description of the cause of diarrhea: You can describe the cause of diarrhea, such as eating unclean food, contracting a virus, etc. This would allow the reader to better understand the protagonist's condition and be more concerned about the protagonist's health. 3. Description of the symptoms of diarrhea: You can describe the symptoms of diarrhea such as increased frequency of defecation, green or yellow excrement, pain, headache, etc. This would allow the reader to better understand the protagonist's physical condition and be more concerned about the protagonist's treatment process. 4. Description of the treatment process of diarrhea: It can describe the treatment process of the protagonist, such as taking medicine, paying attention to diet, rest, etc. This would allow the readers to better understand the protagonist's treatment process and be more concerned about the protagonist's health. 5. Description of the effects of diarrhea: It can describe the effects of diarrhea on the protagonist's body and mood, such as feeling tired, weak, depressed, etc. This would allow the readers to better feel the difficulties and pain of the protagonist and be more concerned about the protagonist's health. It was important to note that when writing a novel, one should try to avoid scientific errors or fictional plots so as not to affect the reader's understanding and appreciation of the novel.