Nausea is a feeling of being queasy and unwell, or being likely to vomit.
Weakness or dizziness may accompany nausea. You may feel the need to sit or lie down, and you may break into a sweat.
Nausea and salivation usually precede vomiting. Vomiting involves expelling the stomach contents through the mouth. The actual act of vomiting involves contractions of the lower stomach, a downward thrust of the diaphragm, and muscular relaxation of the lower esophagus, allowing vomit to be expelled.
Risk factors vary widely and may be unavoidable, as in the case of pregnancy or chemotherapy treatment. Because nausea and vomiting are often secondary to other conditions, they may be difficult to prevent. In the case of causes such as surgery or pregnancy, nausea and vomiting may be unavoidable and unpleasant secondary effects. Patients should be aware of medications that cause nausea and vomiting, and avoid those medications. In cases of infection or obstruction, nausea and vomiting may be considered an important signal that something serious is occurring in your body.
Eating meat or fish that is undercooked or raw—particularly pork or shellfish—puts you at risk for nausea and vomiting associated with food poisoning.
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