New round of funding - applications welcome

IPWSO is pleased to announce a second round of funding for conference and workshops and small projects, kindly made possible by Friends of IPWSO (USA)!  Submit your application by 31 July 2024.  

PWS Diagnosis

We have lots of information about diagnosis. It is the key to finding the support you need for your family. We are also able to fund free diagnosis in some situations.

United in Hope: International PWS Conference – 2025

IPWSO is pleased to announce our 12th International PWS Conference which takes place from 24-28 June 2025 at the Arizona Grand Resort and Spa in Phoenix, Arizona!

 The Conference is co-hosted  with the Prader-Will Syndrome Association | USA and the Foundation for Prader-Willi Research.

Boy with glasses and hat
Boy with glasses and hat


Since 1991 IPWSO has supported national PWS associations, as well as people with PWS, their families and the professionals who work with them. Our vision is a world where people with PWS and their families receive the services and support they need to fulfil their potential and achieve their goals. We are working to achieve this goal by uniting the global PWS community to collectively find solutions to the challenges of the syndrome and to support and advocate for people with PWS and their families, PWS associations, and professionals who work with people with PWS.

two adults and a child

Information for

Find useful guides, research and information to help families manage PWS.

One man one lady at conference

Information for
Medical Professionals

The latest medical and scientific research and information, plus guides into common medical issues affecting people with PWS.

young person with an older person

Information for
Professional Caregivers

Sharing international knowledge among professional service providers throughout the world.

What is PWS?

Free Diagnosis

Find support in my country

three ladies at an IPWSO conference

How we can help

IPWSO is committed to supporting all people with Prader-Willi syndrome and their families, whatever their needs, and wherever they live. Whether you are looking for answers to your questions, information about diagnosis or support to build expertise in your own country, you are in the right place.

three ladies at an IPWSO conference

Latest News

Find out the latest news from IPWSO and stories of interest from around the world. We are always interested to hear your news too, so do get in touch if you want to share a blog post or news of an event or project in your country.

How you can help us

Much of our work is carried out by volunteers and we rely on the generosity of our supporters to fund what we do. Whether you could donate your time, share your story or make a donation towards our work, we would love to hear from you.

Video resources about Prader-Willi syndrome

Learn more about the syndrome with our useful videos including presentations by international experts.

Translated Guides

IPWSO has had many articles translated. Most of these relate to family care of a person with PWS and some are medical articles. You are welcome to download and distribute these articles, but please quote IPWSO as the source.