The HG Collective is an independent systems-change organisation focused on improving recognition, treatment and care for pregnancy sickness, particularly hyperemesis gravidarum (HG). It brings together people with lived experience, healthcare professionals, researchers, policymakers, funders and employers to turn evidence into practical improvements. Its work spans policy advocacy, clinical pathways, professional practice and accountability, with the aim of making care more consistent regardless of where someone lives or which healthcare professional they see.

The organisation provides symptom information and support for people experiencing pregnancy sickness, including guidance on when symptoms may indicate HG and how to prepare for an appointment. For healthcare professionals, it offers clinical guidance, evidence summaries and practical resources to support recognition and treatment. It also works with organisations to improve standards, services, research and decision-making across the maternity system. The HG Collective shares analysis and updates on research, policy and care, and its State of the Nation report sets out evidence and recommendations for change.