Dave Coulier has been diagnosed with stage 3 non-Hodgkin lymphoma and is undergoing treatment to battle the “very aggressive” form of cancer, according to multiple media reports.

Dave Coulier - who many know as character Joey Gladstone - made the shock announcement during a live appearance on America's Today show. The 65-year-old shared he only found out about his diagnosis five weeks ago after finding a ' golf ball size' lump in his groin area, which he initially thought was down to a cold.