From the NHS Choices YouTube channel: A psychiatrist explains the motivation behind Munchausen's syndrome, also known as factitious illness, where someone pretends to be ill or causes symptoms in themselves. This can include inflicting wounds or tampering with blood and urine samples. He also explains the importance of getting treatment and describes another form of the condition where a person fabricates an illness in someone in their care (Munchausen's syndrome by proxy):

Comments from Twitter:

Julie Meadows-Keefe @esq140: Fascinatingly & disturbingly real.

Source:
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