Ascaris lumbricoides is a relatively common parasite in the human digestive system, when it is in the lower gastrointestinal tract, it is easy to crawl out through the anus, or in the stool from the anus, is a relatively common phenomenon. Ascaris lumbricoides is transmitted through the fecal-oral route, and the eggs themselves can be transmitted through the feces, and when the roundworms become adults, they can also crawl out of the anus, and are especially likely to be expelled from the anus during a bowel movement. When the presence of roundworms is confirmed, anthelmintics such as albendazole and thiamphenicol need to be given promptly for treatment. Ascaris lumbricoides can also cause damage to related tissues and organs, such as intestinal perforation and biliary ascariasis, which need to be given promptly for treatment. If roundworms are suspected, it is recommended to go to the hospital in time in order to have a clear diagnosis and treatment.