Parasitic diseases in humans are mainly caused by single-celled organisms and worms. The cysts and eggs of these organisms are generally found in feces which aids in the detection of the parasite in the human host while also providing a means for the parasitic species to exit the current host and enter other hosts. Common symptoms of a parasite infection include constipation, diarrhea, gas and bloating, joint aches, chronic fatigue, excessive hunger, and immune dysfunction. Some parasites block up the large intestinal tract causing constipation while others create sodium and chlorate deficiencies which cause diarrhea. Several other parasites suppress the immune system in order to continue existing in the host, causing immune dysfunction.