Syndrome X

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Syndrome X may refer to:

  • Cardiac syndrome X
  • Metabolic syndrome
  • Single X syndrome, where an individual has a single X chromosome, typically described as Turner syndrome
  • The otherwise unidentifiable rare disease (named "Syndrome X" by her physicians) that afflicted Brooke Greenberg and only about half a dozen other people in the world, none of whom have aged mentally or physically since young childhood, despite living for years or decades. The underlying disorder causing the syndrome remains unknown, unexplained, and virtually undiscovered.