The autonomic nervous system regulates the blood pressure and breathing rates. The system works without a person’s conscious effort. Autonomic nervous system disorders can affect any part of the body. The disorders can be progressive and reversible. The autonomic nervous system controls the internal organs through sympathetic or parasympathetic division nerve fibers, to the brain, pupils, heart, lungs, kidneys, liver, bladder, stomach, intestine, digestive glands, salivary, sweat, digestive glands and genitals.