A parasite is an organism that lives on or in a host and gets its food from or at the expense of its host. A variety of parasites can infect the intestinal tract of human, including roundworm, pinworm, whipworm and tapeworm. They can cause a variety of symptoms, such as fatigue, constipation, diarrhea, vomiting, heartburn, chills, stomach pain or loss of appetite. Parasites enter the human body through contaminated food or water, transmitting agents like mosquitoes, sexual contact and even via nose and skin. Other common causes include poor hygiene, exposure to areas known to have parasites, weak immune system and eating raw and undercooked meat.
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