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.
Problems with nausea and vomiting are related to the cause. Nausea and vomiting from motion sickness, seasickness, food poisoning, or cancer therapy can result in loss of water and electrolytes, which can lead to dehydration. Vomiting and nausea known as morning sickness may occur during pregnancy.1  Nausea is an unpleasant, queasy feeling in the throat or stomach that may result in vomiting. 2  Vomiting is emptying the stomach as a result of strong gagging and retching that leads to throwing up.he following are common causes of nausea and vomiting: 1  Side effects of anesthesia used for surgery. 2  Stomach problems such as blockage (pyloric obstruction, a condition that causes forceful spitting up in infants). 3  Bleeding into the stomach from different causes. 4  Infection, irritation, or blockage of the intestines.