Nausea is an unpleasant feeling in the abdomen that often ends with vomiting. Vomiting is the forceful expulsion of stomach contents through the mouth. Nausea and vomiting are caused by activation of the vomiting centre in the brain. Vomiting is one of the more dramatic ways that the body eliminates harmful substances. It may be caused by eating or swallowing an irritating or poisonous substance or food that has spoiled.
Some people become nauseated and may vomit from the movement of a boat, car, or airplane. Vomiting may occur during pregnancy, particularly in the early weeks and especially in the morning; it can be severe. Many drugs, including anticancer (chemotherapy) drugs and opiate analgesics such as morphine, can cause nausea and vomiting.
A mechanical obstruction of the intestine eventually causes vomiting as food and fluid back. The blockage also, irritation or inflammation of the stomach, intestine, or gall bladder can cause vomiting. Psychological problems also can cause nausea and vomiting (psychogenic vomiting). Such vomiting may be intentional - or instance, a person with bulimia vomits to lose weight. Or it may be unintentional - conditioned response to achieve a benefit, such as to avoid going to school. Psychogenic vomiting also may result from a threatening or distasteful situation that causes anxiety.
In some cases, psychological factors that cause vomiting depend on a person’s cultural background. For instance, most Americans would find eating chocolate-coated ants repulsive, but in other parts of the world they’re considered a delicacy. Vomiting may be an expression of hostility, for instance, a child vomits when angry. Or vomiting may be caused by intense psychological conflict. For example, a woman who wants to have children may vomit on or near the anniversary of her hysterectomy (surgical removal of the uterus)
This article was culled from the publications of Deen Communication Limited