What is the term for people who, when they read symptoms of some psychological disorder, start feeling that they have it?
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I can think of hypochondriasis, although the term is not limited to reading about a disease nor is limited to psychological disorders (but any general illness). The word for a person who suffers from hypochondriasis is hypochondriac.
Somatization may also apply in certain cases.
Wikipedia defines Medical student's disease as a specific form of hypochondriasis triggered by studying different diseases.