Most people don't know if they have a hidden extra organ. But they're surprisingly common and often harmless.
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Articles on Unusual conditions
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Some people have terrifying delusions they are infested with insects, spiders or even small animals. But help is available.
Rapunzel syndrome is an extremely rare medical condition where hairs the person has eaten become tangled and trapped in their stomach.
Gigantism and acromegaly are rare conditions where a benign tumour causes excessive production of growth hormone (GH), which stimulates the growth of the skeleton and all tissues in the body.
Top contributors
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Research Fellow / Clinical Psychologist, RMIT University
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Professor, The University of Queensland
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Senior Lecturer in Anatomy, UNSW
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Psychologist, University of Melbourne
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Henry James Jackson is a Friend of The Conversation.
Professor Emeritus of Clinical Psychology, University of Melbourne
