The causative agent of ascariasis is the nematode Ascaris lumbricoides, which causes ascariasis by parasitizing the small intestine or other organs in humans. Ascaris lumbricoides is milky white or pink in color, and the female can lay 130,000 to 300,000 eggs per day, of which the fertilized eggs can be excreted in the feces and grow and develop into infective eggs in a suitable environment, and if swallowed, they can infect the human body and cause disease. The human body swallowed infected eggs, larvae hatch in the small intestine, with the blood flow through the lungs can occur inflammatory reaction leading to bronchospasm and asthma; adult parasites in the jejunum ileum, can cause incomplete intestinal obstruction; Ascaris lumbricoides drill holes can cause biliary, pancreatic ascariasis, and so on. Food and personal hygiene should be observed in daily life. If there is any discomfort, it is recommended to consult a doctor in time for diagnosis and treatment.