Nausea (Latin: Nausea, from 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, opiates in particular, and may also be a side-effect of a large intake of sugary foods.

Nausea is not a sickness, but rather a symptom of several conditions, many of which are unrelated to the stomach. Nausea is often indicative of an underlying condition elsewhere in the body. Motion 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 "disagree" about the extent to which the body is actually moving, the symptom is presented as nausea, although the stomach itself has nothing to do with the situation. The stomach's involvement comes from the brain's conclusion that one of the senses is hallucinating 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.

Causes of nausea include, but are not limited to:

• Acute HIV infection
• Addison disease
• Anxiety
• Appendicitis
• Brain tumor
• Cancer
• Chronic fatigue syndrome
• Concussion
• Crohn's disease
• Depression
• Diabetes
• Dizziness
• Drugs, whether the drug in use is for reasons that are medicinal, recreational, intentional, and/or unintentional.
• Exercise
• Influenza (rarely and in children; not to be confused with "stomach flu" Gastroenteritis)
• Food poisoning
• Gastroenteritis
• Gastroesophageal reflux disease
• Gastroparesis
• Heart attack
• Hydrocephalus
• Irritable bowel syndrome
• Kidney failure
• Kidney stones
• Ménière's disease
• Migraine
• Morning sickness
• Narcotics
• Nervousness
• Norovirus
• Pancreatitis
• Peptic ulcer
• Sleep deprivation
• Stress
• Superior mesenteric artery syndrome
• Tullio phenomenon
• Withdrawal syndrome
• Vertigo
• Vestibular balance disorder
• Viral hepatitis

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.

Symptomatic treatment for nausea and vomiting may include short-term avoidance of solid food. This is usually easy, as nausea is nearly always associated with loss of appetite. If the patient is dehydrated, rehydration with oral or intravenous electrolyte solutions may be required. Ingesting crushed ice has also proven effective. If the cause of the nausea is motion sickness, sitting down in a still environment may also help.