Large genetic study identifies nine new genes linked to severe pregnancy sickness
A major genome-wide study has expanded the known genetic architecture of hyperemesis gravidarum to ten risk genes, several of which implicate appetite and nausea regulation pathways.
A large-scale genetic study has identified nine previously unknown genes associated with hyperemesis gravidarum (HG) — the most severe form of pregnancy-related nausea and vomiting, which can lead to hospitalisation and significant maternal morbidity. The findings bring the total number of established HG risk genes to ten.
Several of the newly implicated genes are involved in appetite regulation, nausea signalling, metabolism, and brain function. The source item, reported via ScienceDaily, does not specify the institution, lead researchers, or journal; readers should consult the primary literature for full methodological detail. The study design is described as a 'massive genetic study', consistent with a genome-wide association study (GWAS) approach applied to a large cohort.
HG affects a minority of pregnant women but can cause severe dehydration, malnutrition, and — in some cases — pregnancy loss or long-term health consequences for the mother. Understanding its genetic basis may, in future, support more targeted pharmacological approaches, though the reported findings remain at the discovery stage.
The identification of appetite- and nausea-linked pathways is of interest to researchers studying pregnancy complications, to obstetricians, and to genetic counsellors who work with families affected by recurrent HG. The results are also relevant to educators teaching reproductive genetics and to students learning how GWAS methodology is applied to clinically significant but under-researched conditions.
Plain-language version
For patients, families, and general readers. Educational only — not medical advice.
Hyperemesis gravidarum (sometimes called HG) is an extreme form of pregnancy sickness that goes far beyond ordinary morning sickness. It can cause severe dehydration and may need hospital treatment.
Researchers have now found nine new genes that appear to raise the chances of developing HG, bringing the total number of known risk genes to ten. Several of these genes are involved in how the body controls appetite and nausea. This suggests HG has clear biological roots and is not, as has sometimes been assumed, a psychological condition.
This is discovery-level research, meaning scientists have found associations between these genes and HG, but it has not yet led to any new tests or treatments available in clinics. Researchers hope the findings will eventually point towards more targeted medicines.
This is an educational summary, not medical advice. If anything here raises questions for you, please speak with your GP or a clinical professional.
Sources
Read the original reporting — these are the public sources this summary draws from.
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Primary source ScienceDaily · 2026-07-24Major genetic breakthrough reveals hidden causes of severe morning sickness in pregnancy