Ascaris lumbricoides digestive tract and body wall interstitial space called protozoal cavity. Ascaris lumbricoides belongs to the common digestive system parasites, human infection with Ascaris lumbricoides can have anorexia, abdominal pain, diarrhea, nausea, vomiting, cough and other symptoms. It can be complicated by biliary ascariasis, ascaris intestinal obstruction, ascaris encephalopathy, ascaris appendicitis and other diseases. Diagnosis mainly relies on medical history, symptoms and auxiliary examination, and the common examination means are fecal smear, blood routine, abdominal ultrasound, abdominal plain film and so on. The treatment of ascariasis firstly considers anthelmintics, such as albendazole, mebendazole, etc.. For patients with concomitant intestinal obstruction, intestinal perforation, biliary ascariasis and other diseases, surgical treatment can be considered. For diagnosis and treatment of roundworm infection, it is recommended to consult a doctor for guidance.