Causes of nausea

Many factors can cause nausea. The more important of them are…
1    Motion sickness is the most frequent cause of nausea and the same is experienced while traveling in a motor vehicle, ship or airplane.
2    Gastroenteritis, a type of stomach infection
3    Food poisoning: Food poisoning can bring about a sudden onset of vomiting and nausea after 1-6 hours of ingestion of food that is contaminated. The bacteria present in the food produces toxins which contaminates the food. The attack can last for 1 - 2 days.
4    Several medications can possibly bring about nausea. The medications that are most often associated with nausea are chemotherapy regimens as well as general anesthetic drugs.
5     Pregnancy: Nausea, also known as morning sickness is a common enough symptom experienced during pregnancy. In the initial three months almost all pregnant women undergo some degree of morning sickness. Nausea during pregnancy is usually self limiting and mild, but severe attacks of a type of nausea termed hyperemesis gravidarum might need clinical treatment.
6    Disequilibrium: several conditions related to problems connected with equilibrium like vertigo and motion sickness can bring about nausea as well as vomiting.
7    More serious causes: Most instances of nausea are nothing to worry about, but serious causes do exist. They include…

    -    Diabetic ketoacidosis
    -    Surgical problems like pancreatitis, appendicitis, obstruction of the small bowel, meningitis, cholecystitis,
    -    Choledocholithiasis due to gallstones
    -    Addisonian crisis
    -    Andhepatitis etc.