What neurotransmitter prepares the body for fight or flight and is seen in increased levels patients with anxiety-related disorders?

The neurotransmitter that prepares the body for fight or flight and is seen in increased levels in patients with anxiety-related disorders is norepinephrine (noradrenaline). Norepinephrine is primarily released by the sympathetic nervous system and is involved in mediating various physiological responses to stress, such as increased heart rate, elevated blood pressure, and heightened alertness. It is also involved in the regulation of mood and attention. Abnormally high levels of norepinephrine can lead to anxiety and contribute to the symptoms commonly observed in anxiety-related disorders.