Morbidity is related to number of worms harbored in intestines
Light infections often asymptomatic
Heavier infections with variety of manifestations including GI symptoms (abdominal pain, diarrhea, blood in stool, rectal prolapse), malaise, weakness, impaired cognitive / physical development, malnutrition</ref>
Iron-deficiency anemia
Adult worms attach to intestinal wall to feed, causing ongoing luminal blood loss
Adult worms attach to intestinal wall to feed, causing ongoing luminal blood loss
Trichuris trichiura
Taenia saginata
Taenia solium 
Ascaris lumbricoides
Diphyllobothrium latum
Strongyloides stercoralis
Hymenolepis nana
Toxocara canis