The main injuries include mechanical damage to body tissues caused by the parasite, tissue necrosis caused by toxins or enzymes secreted by the parasite, eosinophilic and other inflammatory cell infiltrates caused by the body’s reaction, and even the formation of eosinophilic abscesses. The eosinophilic granuloma is caused by the larvae or eggs. Depending on the worm species and the parasitic site, different symptoms may occur, such as pain around the umbilicus, indigestion, wasting, slow growth, and memory loss in the case of ascariasis. In pinworm disease, itching around the anus or perineum can occur, especially at night, and there can be restless sleep and excessive dreaming. In the case of amoeba infection, it can cause abdominal pain and diarrhea, which can reach about five times a day with a fishy odor and dark red mucus and blood stools, etc. Toxoplasmosis can cause unexplained miscarriage, premature birth, stillbirth, etc.