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IX.
As its consideration is medical, it seems it can be referred to different parts of medicine.
X.
Theoretically considering it, it belongs to Physiology, as it is simply a passion; to Pathology, as a symptom of disease; and to Semeiotics, as a sign.
XI.
Practically weighing it, it belongs to Therapeutics, insofar as it draws the physician's care to itself. Perhaps it may also not inappropriately be referred to hygieinēn the art of preserving health.
XII.
The underlying matter of Pain is the human body according to all its sensible parts, in greater or lesser degree.
XIII.
The form is the very annoying and sad affection of the sense of touch, or a sad sensation.
XIV.
Therefore, two things concur here: namely, that which is annoying in its insolence, and that to which it is annoying, not being accustomed to sensing such a thing or to such a degree.
XV.
And this indeed senses with a faculty which it obtained from nature, whole and not depraved, with the due interval concurring simultaneously between the agent and the patient, and the medium duly disposed.
XVI.
But that thing exists as annoying because it is unusual to the body, whether considered materially or formally, and whether by its substance, or quantity, or quality, or by its action.
XVII.
Accordingly, Galen established nearly two causes of pain: the solution of continuity and a changed natural temperament.
XIIX.
Averroes in 3 Colliget, arguing sharply against Galen and Avicenna, contends that a single changed temperament causes Pain.
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