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The Conversation
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Karin Hammarberg, Adjunct Senior Research Fellow, Global and Women's Health, School of Public Health & Preventive Medicine, Monash University

What causes ‘extreme morning sickness’? What we know, don’t know and suspect about hyperemesis gravidarum

Pregnancy
globalmoments/Getty

Most women experience some nausea and vomiting in early pregnancy.

Although this is called morning sickness, it can happen at any time of day. Up to 80% of women report nausea and vomiting throughout the day.

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