No parasite should live inside a human being. When there are too many "worms" in a person, they can infect the esophagus, stomach, liver, intestines. Symptoms: weight gain, frequent abdominal pain, which can lead to anemia, itching of the anus. Parasites can be contracted through dirty hands, food that hasn't been properly cleaned or contaminated kitchen utensils, and can also come from water. Parasites can enter a person: through the mouth or through the pores...