SECONDARY CAUSES
Among the secondary causes of disease may be mentioned the pathogenic germ, poisons, dietetic errors, abnormal mental states, bodily excesses, exposure to sudden temperature changes, and inhalation of non-poisonous but irritating substances as the most common. Many others might be included but these will suffice for complete illustration of the principle. It will be our endeavor to show how each of these secondary causes operates by virtue of a previous susceptibility, or breaking down of the normal resisting power of the organism caused by subluxation, and how each in turn may bring about increase in subluxation and thus, both directly and indirectly, increase disease.
Bear in mind these two all-important facts. None of these secondary causes can operate without previous subluxation. A subluxation may produce disease without the aid of any secondary cause.