Whale Oil blog founder Cameron Slater has suffered a serious stroke leaving him with "severe impairment".
In a post on the blog, a staff member wrote that Mr Slater has not written a post on the site since later October, explaining that this was due to a stroke.
"In late October Cam had to go to hospital by ambulance not once but twice," the post read.
"After being discharged from his first stay in hospital he had to be readmitted due to complications.
"Cam suffered a serious stroke that left him partially paralysed down his right side and totally paralysed in his right arm including his hand and fingers as well as severe impairment in higher order functioning and moderate speech impairment.
"Prior to this event Cam was perfectly fit and healthy with no predisposing stroke risk factors ... doctors have concluded that the cause of the stroke was entirely due to stress.
"He is approaching his recovery with typical determination (some would say obsession) and a never-give-up attitude.
"Progress is being made, but it is very long and very hard ... Cam cannot concentrate, read or take phone calls for more than ten or fifteen minutes a day.
"He cannot cope with loud noises, background noises or being interrupted and he certainly does not have the ability to form complex thought structures.
The vision in Cam's right eye has also been affected."
The post also alleged that media queries to Mr Slater during his illness had contributed to the stroke, and ended by asking supporters to contribute to a legal fund to fight "his enemies".