Since diseases sometimes occur first in one organ, and sometimes arise with the participation of several organs, as for example, the head participates with the stomach in its diseases, we must indicate the difference between these two things by a certain sign. We will say: we must consider which of the diseases occurred first, and assume that it is the main one, and the second is a contributing one. It should also be considered which disease remains after the disappearance of the first and presumably consider it the main one, and the second - a disease of complicity. Conversely, about a disease by complicity, it is assumed that it occurs after and passes when the first passes, but because of this, sometimes an error occurs. The fact is that the main disease is often not felt at first and does not cause pain, and the harm from it is felt later, after the appearance of a concomitant disease, which in fact is a side disease and arose later than the first, following it.
Concomitant and secondary diseases are thought to be the main disease; Often they only guess about a secondary disease, but do not notice the truly main one at all.
The way to protect yourself from this mistake is for the doctor to know which organs are involved in diseases - and this is achieved by knowledge of anatomy - and to know what damage affects this or that organ, which of them are felt and which are not. He should not rush to identify the disease, and not decide that it is the main one until he considers the diseases that could accompany it, and carefully question the patient whether he feels signs of diseases that can affect the organs associated with the diseased organ.
Sometimes a concomitant disease is not felt, does not cause obvious suffering and does not cause manifestations close to it in nature, but it is accompanied by tangible phenomena that are far from it. The patient does not know that they are manifestations of that underlying, distant disease, and only the knowledge of the doctor can lead to this. Most often, the doctor comes to this by considering dysfunction. If he sees that these disorders preceded the disease, he decides that several organs are involved in this disease. However, among the organs there are those in which diseases most often arise later than diseases in other organs. Thus, diseases of the head in most cases exist together with diseases of the stomach, but the opposite of this happens less often. We will present to you the signs of disorder of the main and secondary natures in a general form; as for the natures inherent in individual organs, they will be discussed below in the appropriate section.
As for the signs of combination diseases, those signs that are external can be recognized by feeling, but the signs that appear from the inside, except for congestion, blockage, tumors and disruption of continuity, are difficult to combine in a general reasoning. The same can be said about 6a congestion, blockage, swelling and disorder relating to individual organs, so it is better to postpone all this until discussing specific diseases.