Research into HG is ongoing and numerous studies are published in peer reviewed academic journals. In the subpages are lists of research paper titles with links to their abstracts. These are divided into 5 sub sections under the headings Genetic factors, Psychology, Review Articles, Safety of Medications and Treatments for HG.
The Pregnancy Sickness Support website has a section on research and resources at PSS Research and Resources, a section for healthcare professionals which includes links to research at PSS Healthcare Professionals and a major literature review of NVP at PSS Literature Review
The HER website has a section on research, accesible via this link http://www.hyperemesis.org/HER-Research/
The Motherisk website has lists of research papers and abstracts at Motherisk