symptom verbal reports and existential-physiological discrepancy

While the anatomical basis of how nerve projections enable perception of the body is rather well known, physicians confront situations where patient verbal reporting about symptoms does not match models based on neurophysiological mechanisms. For instance, the Merck Manual Medical Library (2009) states:
“Painful stimuli from thoracic organs can produce discomfort      described as pressure, gas, burning, [...]