1–3 in 100
pregnancies are affected by HG
Source: Royal College of Obstetricians and Gynaecologists, Green-top Guideline No. 69, 2024
Improving care for pregnancy sickness and hyperemesis gravidarum
Pregnancy sickness can have a profound effect on health, wellbeing and daily life. From nausea and vomiting in pregnancy through to hyperemesis gravidarum, we're working to improve recognition, treatment and support through better policy, stronger clinical standards and evidence-led care.
Start here
What do you need today?
I need information about my symptoms
Understand pregnancy sickness, when it may be HG and how to prepare for an appointment.
Find out more →I work in healthcare
Access current clinical guidance, evidence summaries and practical resources for recognising and treating pregnancy sickness and HG.
View professional resources →I want to improve systems
Explore our work to improve policy, pathways, standards, research and accountability across pregnancy sickness and HG.
See how we work with organisations →Why this work matters
The evidence is clear. Care is not consistent.
Scientific understanding and clinical guidance for nausea and vomiting in pregnancy and HG have moved forward. Recognition, treatment and care pathways have not moved with them everywhere.
28.7%
of responding hospitals routinely screened for NVP or HG at the booking visit
47%
of responding hospitals correctly prescribed a combination of recommended first-, second- and third-line anti-sickness medicines
What we do
People should not have to fight for the care that guidance already promises.
The HG Collective brings together lived experience, research, healthcare expertise and policy advocacy to improve how pregnancy sickness and HG are recognised, treated and measured.
Policy
Put pregnancy sickness and HG into national priorities, standards and decision-making.
Pathways
Define what timely, consistent and evidence-based care looks like.
Practice
Give professionals practical tools that improve recognition and treatment across the spectrum.
Evidence
Turn data and lived experience into accountability and change.
Pregnancy sickness and HG
More than “morning sickness”. A real health impact.
Pregnancy sickness exists on a spectrum. It can disrupt eating, drinking, work, family life and emotional wellbeing even when someone does not meet the definition of HG. At its most severe, HG can leave someone unable to manage ordinary daily life and in need of urgent or hospital-based treatment.
Clear information matters—but it must lead to timely assessment, effective treatment and care that takes the condition seriously.
Understand pregnancy sickness and HG
Our national report
What the UK needs to change now.
Our State of the Nation report brings together the evidence on prevalence, access, treatment, mental health and service variation—and sets out a practical route to reform.
Coming soon
Latest thinking
Evidence, analysis and action
Our latest writing on pregnancy sickness and HG research, maternity care, policy and the changes needed across the system.
Opinion · 28 July 2026
If Men Had Hyperemesis Gravidarum, We Would Never Have Called It "Morning Sickness"
Read article →Policy · 10 July 2026Hyperemesis Gravidarum Tells Us More About Our Maternity System Than We Think
Read article →Policy · 20 June 2026A Single National Formulary Could Transform Women's Health — If We Get It Right
Read article →About us
Independent. Evidence-led. Built for change.
The HG Collective is an independent systems-change organisation working to improve recognition, treatment and care across the spectrum of pregnancy sickness, with particular expertise in hyperemesis gravidarum.
We bring together people affected by pregnancy sickness and HG, healthcare professionals, researchers, policymakers, funders and employers to turn evidence into change.
Meet The HG CollectiveStay informed
Evidence, policy and progress—once a month.
Receive significant developments in pregnancy sickness and HG research, care and policy, along with updates from The HG Collective.