Ascaris lumbricoides is the most common parasite in the human intestinal tract. Adult male worms are 15-31 cm long, female worms are 20-35 cm long, and sometimes even up to 40 cm or more. Ingestion of infective ascaris eggs can lead to ascariasis, and it is recommended to seek medical treatment. Ascaris lumbricoides is the largest parasitic nematode in the human intestine, and the adult body is slightly pink or slightly yellow, with horizontal lines on the body surface, cylindrical and earthworm-like. Adult roundworms are parasitic in the small intestine and are infected through accidental ingestion of water or food contaminated with roundworm eggs, and the infection rate is higher in rural areas than in cities and in children than in adults. After the human body is infected, symptoms such as fever, cough, loss of appetite or hunger, paroxysmal pain around the umbilicus, malnutrition, insomnia, teeth grinding, etc. can appear in different degrees, and sometimes can cause serious complications. For example, roundworms twisted into clusters can form roundworm intestinal obstruction, burrow into the bile duct to form biliary ascariasis, enter the appendix to cause appendicular ascariasis, etc. Diagnosis can be made by stool examination, and eggs or adult worms can usually be seen microscopically. Commonly used deworming drugs for treatment include prothiimidazole, mebendazole, levamisole, and piperazine citrate, which are more effective. If the symptoms are more severe, with severe pain and complications of obstruction, prompt surgical treatment is required. Usually develop good hygiene habits, wash hands before meals and after stools, do not eat unwashed vegetables, fruits and melons, do not drink raw water and bite nails to prevent ingestion of roundworm eggs and prevent roundworm disease.