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.
Other drugs, such as aspirin and other anti-inflammatory agents, while best absorbed without food, are so irritating to the stomach that they can cause pain, diarrhea, and nausea (Table 1). Effects of Alcohol, Caffeine, and Tea. Alcohol, caffeine, and some teas can increase the effect of certain drugs.