Intestinal parasites infect and reside your gastrointestinal tract. You can become infected with two types of intestinal parasites--protozoa and heleminths. Protozoa are microscopic parasites, where as heleminths are worms that are visible to naked eye in their adult stages. Either of these parasites enters your body through contaminated food, water or skin contact. Abdominal pain, gas, dysentery, nausea and vomiting are some of the common symptoms of an intestinal parasitic infection. While there are prescription medications to eliminate these parasites, there are also home remedies you can try.