The essential pathology of shock is identical whatever the cause. If, however, instead of an intense overwhelming activation, the kinetic system is continuously or intermittently overstimulated through a considerable period of time, as long as each of the links in the kinetic chain takes the strain equally the result will be excessive energy conversion, excessive work done; but usually, under stress, some one link in the chain is unable to take the strain and then the evenly balanced work of the several organs of the kinetic system is disturbed. If the brain cannot endure the strain, then neurasthenia, nerve exhaustion, or even insanity follows. If the thyroid cannot endure the strain, it undergoes hyperplasia, which in turn may result in a colloid goiter or in exophthalmic goiter. If the adrenals cannot endure the strain, cardiovascular disease may develop. If the liver cannot take the strain, then death from acute acidosis may follow, or if the neutralizing effect of the liver is only partially lost, then the acidity may cause Bright's disease. Overactivation of the kinetic system may cause glycosuria and diabetes. Identical physical and functional changes in the organs of the kinetic system may result from intense continued stimulation from any of the following causes: Excessive physical labor, athletic exercise, worry or anxiety, intestinal autointoxication, chronic infections, such as oral sepsis, tonsillitis, and adenoids; chronic appendicitis, chronic cholecystitis, colitis, and skin infections; the excessive intake of protein food (foreign protein reaction); emotional strain, pregnancy, stress of business or professional life-- all of which are known to be activators of the kinetic system.