Nausea (Latin: Nausea, Greek: , "sea-sickness", also called wamble) is the sensation of unease and discomfort in the stomach with an urge to vomit.

Causes

Nausea is also an adverse effect of many drugs, and may also be an effect of a large intake of sugary foods.

Nausea is not a sickness, but rather a symptom of several conditions, many of which are not related to the stomach. Nausea is often indicative of an underlying condition elsewhere in the body. Travel sickness, which is due to confusion between perceived movement and actual movement, is an example. The sense of equilibrium lies in the ear and works together with eyesight. When these two don't "agree" to what extent the body is actually moving the symptom is presented as nausea even though the stomach itself has nothing to do with the situation. The reason for the stomach's involvement is thought to be the brain concluding that one of the senses is hallucinating, and further conclude that this is due to poison ingestion. The brain then induces vomiting to clear the supposed toxin.

In medicine, nausea can be a problem during some chemotherapy regimens and following general anaesthesia. Nausea is also a common symptom of pregnancy, in which it is called "morning sickness." Mild nausea experienced during pregnancy can be normal, and should not be considered an immediate cause for alarm.

Other causes of nausea:

• Addison disease
• Amusement park rides
• Alcoholism
• Anxiety
• Appendicitis
• Brain tumor
• Bulimia
• Cancer
• Chronic fatigue syndrome
• Concussion
• Crohn's disease
• Depression
• Diabetes
• Exercise
• Flu
• Food poisoning
• Gastroenteritis
• Gastroesophageal reflux disease
• Gastroparesis
• Heart attack
• Hydrocephalus
• Irritable bowel syndrome
• Kidney failure
• Kidney stones
• Medications
• Ménière's disease
• Migraine
• Morning sickness
• Narcotics
• Nervousness
• Norovirus
• Pancreatitis
• Peptic ulcer
• Sleep deprivation
• Superior mesenteric artery syndrome
• Tobacco smoking and second-hand smoke
• Tullio phenomenon
• Withdrawal Syndrome
• Vertigo
• Vestibular balance disorder
• Viral hepatitis
• Acute HIV infection

Treatment

While short-term nausea and vomiting are generally harmless, they may sometimes indicate a more serious condition, such as coeliac disease. When associated with prolonged vomiting, it may lead to dehydration and/or dangerous electrolyte imbalances.