The pathophysiology of anxiety is attributed to various theories that have been proposed which constitute: Biologic, psychoanalytic, learning, and  genetic component. There is increased sympathetic tone, decreased levels of inhibitory neurotransmitter GABA, and alterations in neurotransmitters such as dopamine and serotonin. A gene coding for serotonin transport has also been implicated.
Anxiety pathophysiology
Anhedonia pathophysiology
Acute stress disorder pathophysiology
Personality disorder pathophysiology
Generalized anxiety disorder pathophysiology
Amnesia pathophysiology
Insomnia etiology
Labile affect