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.
Nausea often occurs along with vomiting, or before vomiting starts, but you may experience nausea without ever vomiting. Nausea is described as a way that the body reacts to a large variety of irritants and invaders, according to the University of Maryland Medical Center. A variety of factors may cause constant nausea.