by 
The Curious Bag
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Nausea and light headedness, which often precede vomiting, are not the end result of a specific infection or environmental factor, but rather the symptoms of a myriad of medical issues.
External Causes
Some causes of nausea that do not originate inside the body are motion sickness, food or drug reactions, allergic reactions, overeating, concussion or head injury, or unpleasant odors.
Internal Causes
Some biological processes or internal diseases can cause nausea. These include intense pain (from some other source), emotional stress, gall bladder disease, heart attack, brain tumors and gastroperesis.
Vertigo
If nausea is severe enough to impair motor skills and vision, and is not accompanied by vomiting or the urge to vomit, it may be a sign of a more serious condition like vertigo (lightheadedness or dizziness).
Pregnancy
Fifty to 90 percent of women in the early stages of pregnancy experience nausea. In 25 to 55 percent, this nausea progresses to vomiting.
Chemotherapy
Cancer patients undergoing chemotherapy can experience nausea and vomiting.
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