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.
Some causes of nausea are not easily prevented. While the cause of your nausea is being determined, you can minimize episodes of nausea by following some basic guidelines: Eat small meals every few hours so your stomach won't feel full. Try to avoid bothersome odors such as perfume, smoke or certain cooking smells.