According to these criteria, you must have certain signs and symptoms before a doctor diagnoses irritable bowel syndrome.

CNN: Irritable bowel syndrome

In the consultation of the future I think patients will interact with a computer programme before seeing the doctor which will objectively assess the patient's symptoms and provide a list of possible diagnoses.

BBC: Our medieval medicine

One doctor was quoted as saying the unofficial instruction being passed down was to use diagnoses that sounded "less frightening".

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