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 and vomiting - adults. Nausea is feeling an urge to vomit. It is often called being sick to your stomach.. Vomiting or throwing-up is forcing the contents of the stomach up through the esophagus and out of the mouth. Many common problems may cause nausea and vomiting, including: 1  Food allergies.  Infections of the stomach or bowels, such as the stomach flu or food poisoning.