""I don't like the expression hypochondriasis," says Dr Florian Ruths, a psychiatrist and cognitive therapist who features in the film, "because it suggests that people are imagining their symptoms.

What people, including GPs, have to understand, is that patients do experience real symptoms, real pain."

And this isn't only psychosomatic. Many sufferers prod their body repeatedly, checking for lumps or swelling, which can, again, induce genuine physical pain."

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