funny thread. agreed, psychological, not physiological.
when i was experiencing extreme neurosis, not only was i paranoid and avoidant, but i also constantly obsessed about how i might have this disease, or that virus. "maybe i have cancer." "oh god, i'm pregnant." "i'm going to die of this disease that there is no cure for!" every symptom led me to believe i would probably die.
i agree, there were definitely underlying emotional causes.