Ascaris lumbricoides is a parasite that is relatively easy to see in the digestive tract, and adults can be infected with roundworms. Roundworms are primarily transmitted fecally-orally and can be parasitized when food or water contaminated with roundworm eggs is eaten or consumed. Usually roundworms parasitize the intestines, but they can also enter the biliary tract, appendix, and pancreatic duct. So both adults and children can be infected with roundworms. After infection with roundworms, there may be abdominal distension, abdominal pain, vomiting, and also digestive symptoms such as decreased or no bowel movements and defecation; because roundworms have the habit of drilling holes, they can easily burrow into the biliary tract, appendix, or pancreatic ducts, which can cause sudden severe pain in the right upper abdomen, fever, vomiting, and other symptoms. In your daily life, you should pay attention to good habits, wash your hands before and after meals, and wash the fruits and vegetables you eat. If the above symptoms exist, early examination and treatment in hospital is recommended.