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January 9, 2012
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Nausea and Vomiting

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Introduction to nausea and vomiting

Nausea and vomiting are symptoms of an underlying disease and not a specific illness. Nausea is the sensation that the stomach wants to empty itself, while vomiting (emesis) or throwing up, is the act of forcible emptying of the stomach.

Vomiting is a violent act in which the stomach has to overcome the pressures that are normally in place to keep food and secretions within the stomach. The stomach almost turns itself inside out - forcing itself into the lower portion of the esophagus (the tube that connects the mouth to the stomach) during a vomiting episode.

What causes nausea or vomiting?

There are numerous causes of nausea and vomiting. These symptoms may be due to the following:

  • acute gastritis

  • central causes (signals from the brain)

  • association with other illnesses remote from the stomach

  • medications and medical treatments

  • mechanical obstruction of the bowel

Acute gastritis

Acute gastritis (gastro=stomach + it is= inflammation) is often caused by an offending agent which irritates the lining of the stomach. Examples of these include:

  • Infections: Infections are often the cause, whether it is a common virus or an infection that is contracted from travel. There may be associated crampy upper abdominal pain, fever ,and chills may be present. Common viral infections include noroviruses and rotavirus. Parasitic infections often are associated with diarrhea but may also have a component of nausea and vomiting. Infection by bacteria in the Helicobacter family (like H. Pylori) can also be the infectious agent.

  • Stomach flu: Stomach flu is a non-specific term used to describe vomiting and diarrhea associated with a viral infection. It should not be confused with influenza, whose symptoms include fever, chills, cough, and myalgias (muscle pain).

  • Food poisoning: Food poisoning may cause significant vomiting and usually is caused by a bacterial toxin. Symptoms begin within a couple hours of eating contaminated or poorly prepared food and may last for 1-2 days. Sources of food poisoning include Salmonella, Campylobacter, Shigella, E. coli, Listeria, or Clostridium botulinum (botulism).

  • Other stomach irritants: alcohol, smoking, and non steroidal anti-inflammatory medications such as aspirin and ibuprofen may irritate the stomach lining.

  • Peptic ulcer disease: Peptic ulcer disease can range from mild irritation of the stomach lining to the formation of a defect in the protective lining of the stomach called an ulcer.

  • Gastroesophageal reflux disease (GERD, reflux esophagitis): Nausea or vomiting is also associated with irritation of the lining of the esophagus



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Nausea and Vomiting

What happens during a brain hemorrhage?

When blood from a trauma irritates brain tissues, it causes swelling. This is known as cerebral edema. The pooled blood collects into a mass called a hematoma. These conditions increase pressure on nearby brain tissue, and that reduces vital blood flow and kills brain cells.

Bleeding can occur inside the brain, between the brain and the membranes that cover it, between the layers of the brain's covering or between the skull and the covering of the brain.

What causes bleeding in the brain?

There are several risk factors and causes of brain hemorrhages. The most common include:

  • Head trauma. Injury is the most common cause of bleeding in the brain for those under 50.
  • High blood pressure. This chronic condition can, over a long period of time, weaken blood vessel walls. Untreated high blood pressure is a...

Read the Brain Hemorrhage article »






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