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An answer has turned up in Britain's Guardian newspaper, as a psychologist speculates on why people write illness blogs. Here, a fellow cancer blogger, Sue Eckstein, quotes Dr. Tom Farsides:
"I'm just one of many hundreds of people who blog about their illness or trauma, and, according to Dr Tom Farsides of Sussex University, this is not surprising: 'Writing is an effective way of processing and coming to terms with challenging and potentially traumatic events,' he says. 'But blogging is more than the mere act of writing. It also fosters senses of both control and social connection, each of which is crucial for psychological wellbeing.'"
Oh, yeah. That's why.