Immunity is the capacity that the body develops to be able to distinguish between the "self" (which must be protected) and the "non-self", an external aggressor that must be eliminated in order to protect the self. This ability to distinguish or this immunity is put in place from birth and lasts for several years. The child's immune system is generally considered mature between the ages of 6 and 8.

Many children develop immunity or allergy problems at an early age. It is probably the somatization of an unconscious process, somatization that reveals how much the child has already had to fight to exist, to build himself, to be "him". This immune imbalance is already a sign of the inner struggle that the child faces in order to build a self-image. Building an identity is a colossal task, but keeping it is often just as difficult and complicated. If the child does not manage to find his own identity and to build are inner self, his unconscious will be able to induce an autoimmune type of disease, but it is the same for the adult, because the unconscious has no limit in time, of which it ignores moreover the notion.
And as explained by Dr. Pierre-Jean Thomas-Lamotte in his book Et si la maladie n'était pas un hasard? :

"The inner language triggers the disease according to the past, present and future".

Thus, a conflict of loss of identity or loss of "self" experienced in childhood can remain silent for a lifetime or for several years. An adult who loses his or her identity or whose identity is violated (in his or her deepest values) may therefore develop an autoimmune disease or an immune problem (excess => allergies or deficit => cancer, for example), because this system loses at that moment the markers that normally mark the boundary between the "me" and the "not-me.

It is obvious that all of these processes take place unconsciously. Once the person is or becomes aware of the predicament or conflict they are experiencing, they will thwart it and the illness will likely not develop.

One of the ways to avoid the traps of the unconscious and to avoid pathological development is to be able to express one's suffering and one's feelings from a physical, emotional and psychological point of view. This "other" can simply be a friend or confidant, it does not have to be a therapist. Expressing to the other, not only the experience of the body, but also all the emotions that accompany it, plays the role of catharsis, of outlet and defuses the emotional charge that could have triggered a health problem.
Reflecting on the subject of one's own deep reference values (pillars of our beliefs and walls that support our mental functioning), becoming aware of them, learning to respect them and to make them respected, also helps to avoid the "violation" of defense barriers. Expressing and externalizing the fact that they have been crossed or exceeded also helps to protect oneself.
Regardless of the type of emotional conflict experienced, in order to try to protect oneself from health problems, one must avoid experiencing conflict in solitude and in the unspoken. In short...talk about it!