Nausea is a subjective unpleasant feeling, feeling like vomiting or immediate urge to vomit, often has an extreme characteristics. An exact mechanism is not properly known. It is coordinated from higher centers in cerebral cortex (in contradiction to vomiting which has its centers in medulla oblongata). Vomiting accompanies nausea often, however, it isn't a rule.
Based on the clinical examination, nausea can be divided to:
- acute nausea (and vomiting) – mostly caused by an acute infection (food poisoning, gastrointestinal), acute pancreatitis, cholecystitis, appendicitis, drug reaction, pregnancy, headaches (even a head trauma might cause an acute nausea), diabetic ketoacidosis, …
- chronic nausea (and vomiting) – broad spectrum of illnesses, gastrointestinal illnesses (mechanical issues of the system, motility dysfunction or functional dysfunctions), psychiatric disorders (depression), alcohol and drug addiction, intracranial disorders (intracranial hypertension), endocrinopathies (hyper- or hypothyroidism, Addison's disease), malignity (gastrointestinal and other), …
Anamnesis-speaking, it is necessary to find out the period how long does the nausea occur, beginning of symptoms (acute or slowly increasing), prior or post per oral intake, medication influence, other symptoms (vomiting, abdominal pain, diarrhea, constipation, diplopia, eye vision problems).
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