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.
Make an appointment with your doctor if: 1  Vomiting lasts more than two days for adults, 24 hours for children under age 2 or 12 hours for infants. 2  You've had bouts of nausea and vomiting for longer than one month.  You've experienced unexplained weight loss along with nausea and vomiting.