Nausea and vomiting may occur due to low sodium levels. Vomiting can stimulate the release of an anti-diuretic hormone, and this worsens the condition. It promotes retention of water and dilutes the sodium level further.
Many over-the-counter medications exist for treatment of nausea. Ginger is also commonly used to treat nausea and sucking on a ginger candy may help. It is very important to replace fluid. You need to drink more but make sure that your consumption should increase over a period. It is possible to drink too much, too quickly. But, you should also consider drinking a rehydration beverage that contains electrolytes.

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