In all these conditions the serotonine levels have been found to be low. Increased activity in LC is associated with feelings of anxiety, anger, fear and frustration. It seems plausible that it is the increased LC activity that is the cause of the unpleasant mood associated with stress. There seems to be a reciprocal mechanism involved here. Anxiety is psychologically defined as a diffuse sense of being threatened, which is stress-provoking.
Anxiety leads to increased stress hormone levels.
So when anxiety is provoked for primarily psychological reasons, it increases the stress level. And the physiology of stress in turn increases anxiety through the increase of LC activity. On the other hand, when stress is primary, it causes increased anxiety that reinforces the stress condition. TM gives rise to a positive serotonine balance TM has been found to lower the cortisol level. A lowering has been demonstrated during TM practice.