Roundworms in the stomach are usually slightly pinkish or yellowish in color, and the tail of male worms may be curled. Ascaris lumbricoides is a common digestive tract parasite and the largest parasite in the human intestinal tract. Its adult body is yellowish or pinkish in color, with transverse stripes on the body surface, and the adult Ascaris lumbricoides is cylindrical and earthworm-like, and the tail of the male worm may be curled; Ascaris lumbricoides has oval-shaped eggs, and the surface of the egg shell is often accompanied by a layer of rough and uneven protein film. Ascaris lumbricoides enters the body mainly through the oral cavity, causing ascariasis and various complications, and the roundworm eggs can also be transmitted through the feces of infected persons. Patients with suspected roundworm infections are advised to seek medical attention.