Gastrointestinal nematodes are a type of parasitic worms that inhabit the digestive tracts of animals, including humans. They can cause a variety of symptoms, including diarrhoea, vomiting, abdominal pain and weight loss. Gastrointestinal nematodes are the most common type of helminth, a broad term for parasitic worms, and they can be divided into two distinct categories: roundworms and tapeworms. Roundworms, also known as nematodes, are the most common type of gastrointestinal nematode. They enter the body through contaminated food or water and can also be transmitted through direct contact with infected animals or people. Roundworms can cause a wide range of symptoms, from mild discomfort to severe abdominal pain and diarrhea. Treatment typically includes medications to kill the worms and supportive care to alleviate symptoms. Tapeworms are another type of gastrointestinal nematode. They are flat, segmented worms that can grow up to several feet long. Tapeworms can cause a variety of symptoms, including abdominal pain, nausea, vomiting, and weight loss. Treatment typically includes medications to kill the worms and supportive care to alleviate symptoms. Gastrointestinal nematodes can be difficult to diagnose and treat. If left untreated, they can cause serious health complications, including malnutrition, dehydration, and anemia. It is important to seek medical attention if you experience any of the symptoms associated with gastrointestinal nematode infections. Your doctor can determine the type of worm and provide appropriate treatment.