Poor nutrition.
Viral infection - intestinal flue.
Gut infection caused by bacteria.
Worm infection.
Infection outside gut-ear-tonsils.
Malaria.
Food poisoning.
Too much unripe fruit.
Heavy,greasy food.
Laxatives.
Certain poisons.
Allergy to Medicine Tetracycline.
Allergy to seafood/food.
Allergy to cow's milk.