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What causes morning sickness?

The exact causes of morning sickness are not clear. A range of theories have been suggested, including changes in hormone levels, or reductions in blood pressure or blood glucose (sugar) level, but none of these has been proven. You are more likely to experience morning sickness if you: have experienced morning sickness in a previous pregnancy; tend to experience motion sickness; have had gastrointestinal problems, such as reflux or stomach ulcers; have menstrual migraines; experience nausea or vomiting when taking estrogen-based medication; are having a multiple pregnancy, or; are having a molar pregnancy.

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Author: Lauren Donley BSc (Hons)
First answered: 10 Nov 2014
Last reviewed: 19 May 2018
Rating: 4.8 out of 5
Votes: 1550 (Click smiley face below to rate)
Category: Motion sickness

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