We should be aware of the fact that stress is the "bad guy" causing all of these disorders.
Stressing factors can be mechanical (overeffort, contusions, forced body postures); physical (cold, heat, electricity); chemical (acid, toxic); infectious; "negative" emotions (hate, fear, guilt); or certain inconvenient "rigid" behavior (omnipotence, oppression, submission).

Stress body reactions can be: musculoskeletal pain; contractures-shortening of muscles; postural disorders; aching joints; unbalance of bone joints (specially in the sphenoides and other skull bones); changes in corporal, emotional and mental behavior; and other symptoms over the rest of the body (allergies, immunity level descent, high blood pressure, gastritis).

These disorders "reinforce" the unusual response of the Central Nervous System. The consequence is a true "feedback" (stressors –brain answer- symptoms- more stress) that encourages chronic symptoms.