DR RV ANAND CONSULTANT NEUROLOGIST SAI NEURO CLINIC ABHIRAMAPURAM PARKINSON DISEASE AUTONOMIC DYSFUNCTION autonomic nervous system works to control the automatic functions of the body such as heart rate , respiration rate, sweating, urination and sexual arouasal. parkinson patients can have low blood pressurec on standing up.they feel light headed or dizzy.they , may have constipation, difficulty swallowing.lack of urine control and sexual dysfunction either decreased or increased sexual desire