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cardiac neurosis

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noun Pathology.
  1. an anxiety reaction characterized by quick fatigue, shortness of breath, rapid heartbeat, dizziness, and other cardiac symptoms, but not caused by disease of the heart.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
effort syndrome in Medicine

effort syndrome

(ĕfərt)
n.
  1. neurocirculatory asthenia