Since the discourse community itself is intangible, it is easier to imagine discourse communities in terms of the fora in which they operate. The hypothetical journal and email list can each be seen as an example of a forum, or a concrete, local manifestation of the operation of the discourse community.
Daily nausea can be caused by stress. An ulcer in the small intestine may cause chronic nausea. Excessive consumption of caffeine can cause nausea. A person may develop chronic nausea in relation to a peptic ulcer. Indigestion is one of the most common causes of nausea.
The most common causes of dehydration are: poor fluid intake during an illness. fluid losses from diarrhea and/or vomiting. Healthy children can vomit or have loose stools once in a while without becoming dehydrated. But dehydration can occur suddenly and be very dangerous, especially for babies and young children. If children are vomiting, have watery stools, and are not able to drink, they can lose fluids quickly and become very sick.