What are some causes of excessive norepinephrine? What tests are used to determine this?

Noradrenalin. Comes from dopamine which is another neurotransmiter and it is a hormone that helps us stay alive during stress. It has many important other function from the memory to the heart rate and wellbeing sensation.Regulators" such as angiotensine II and epinephine increase it.Also cocaine, amphetamines(speed), and antidepressants increase the reuptake. Can be an adrenal tumor (pheochromocitoma)