In those two books, the existential shows itself gradually—breast cancer in the first, a physiological tropism in the second.
For physiological reasons, stress can be extremely damaging.
Thus, catharsis, in a physiological sense, has been difficult to substantiate, but the results are by no means conclusive.
physiological phys·i·o·log·i·cal (fĭz'ē-ə-lŏj'ĭ-kəl) or phys·i·o·log·ic (-ĭk)
Of or relating to physiology.
Being in accord with or characteristic of the normal functioning of a living organism.
Relating to the action of a drug when given to a healthy person, as distinguished from its therapeutic action.