Ascaris lumbricoides is a species of roundworm that commonly infects humans. It is also known by synonyms such as giant roundworm and common roundworm. This parasitic worm can grow up to 35 cm in length and can cause a range of symptoms including nausea, abdominal pain, and weight loss. Other synonyms for Ascaris lumbricoides include intestinal roundworm and lumbricoid worm. This species is found in many parts of the world, particularly in areas with poor sanitation and hygiene. Treatment options include medications such as albendazole and mebendazole, as well as the removal of the worms through endoscopy or surgery in severe cases.