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Nausea also can be a side effect of medications. Cancer treatments such as chemotherapy may cause constant mild nausea and a frequent urge to vomit. Additionally, women in early pregnancy often experience constant mild nausea, or morning sickness..
Causes of Nausea. Nausea may be the No. 1 culprit of an upset stomach. Being nauseous is uncomfortable and often stops a person in their tracks. It can seem like the queasy feeling will never go away. However, what causes nausea can sometimes be hard to pinpoint. Nausea is commonly caused by: Stomach flu. Migraine. Rotavirus.