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.
Bad-You feel nauseous most of the day and vomit twice per day. You have trouble keeping food down and the smell of certain foods not only causes a loss of appetite, but also triggers dry-heaving or vomiting. Just the thought of eating a particular type of food can trigger vomiting or dry heaving. Severe-You have to plan your day around your morning sickness.