The largest study ever conducted on pregnancy-related nausea and vomiting has revealed links between severe morning sickness and long-term mental health risks, raising what researchers call "very serious" concerns.

The study—led by King's College London and the South London and Maudsley NHS Foundation Trust—examined the records of 476,857 pregnant women diagnosed with hyperemesis gravidarum (HG), a condition marked by extreme and persistent nausea and vomiting.

Researchers analyzed anonymized electronic health data from 135 healthcare providers across 18 countries, making it the most comprehensive investigation into HG and mental health outcomes to date.

While nausea is common in pregnancy , HG affects up to 3.6 percent of expectant mothers and is the leading cause of hospital admissi

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