The Sympathetic branch is responsible for energy expenditure (“fight or flight”) and the Parasympathetic branch is responsible for energy conservation and restoration (“rest and digest”).
If the Sympathetic commands are disrupted people feel tired, crave salt or sugar, or get anxious. People may get heart palpitations, tingling or numbness, disrupted night vision, varicose veins, erectile dysfunction, stiff necks and shoulders, headaches and insomnia.
If the Parasympathetic commands are disrupted they affect the intestinal tract (heartburn or constipation), immune system (autoimmune disorders), and produces chronic pain syndromes. People may get sleep apnea, “restless legs”, morning nausea, night sweats/hot flashes, or power surge sensations when they should be at rest, and non-restorative sleep.