AVP and hypertensive disorder: Peripheral nervous system symptoms often involve motor neuropathy and sometimes sensory abnormalities.[11] Autonomic nervous system symptoms can cause hypertension, tachycardia, sweating, electrolyte imbalances, and hyponatremia.[12] The mechanism of tachycardia may be related to sympathetic overactivity and increased catecholamine levels, while hyponatremia may result from hypothalamic impairment, abnormal antidiuretic hormone secretion, vomiting, inadequate sodium intake, and increased renal sodium excretion.