E.<unk>  are mostly harmless parasites, and do not cause harm to the host. However, there have been cases of internal bleeding. Usually, the cytoplasm of the E.<unk>  "does not contain red blood cells, except in the rare case of patients with intestinal hemorrhage" that leads to blood in the stools of these patients. This may lead to intestinal lesions. Other problems that E.<unk>  causes are usually result from having too many in the large intestine. For example, large populations of E.<unk>  may lead to "dyspepsia, hyperacidity, gastritis, and indigestion"; these are common problems of most intestinal parasites.
Entamoeba coli
Entamoeba histolytica
Ascaris lumbricoides
Entamoeba moshkovskii
Schistosoma haematobium
Schistosoma mansoni
Taenia solium
Cryptosporidium parvum