Published by BLS on its YouTube channel:
The British Lymphology Society exists to preserve and protect good health of people living with lymphoedema / chronic oedema. Lymphoedema occurs when the lymphatic drainage system fails; chronic oedema is indicative of failure of lymphatic drainage. Both of these terms are used interchangeably to emphasise the need to manage both the initial cause of the chronic oedema and the lymphatic failure concurrently.
thebls.com