postural orthostatic tachycardia syndrome (MONDO_0011479, a Monarch Disease Ontology entry) is a condition characterized by development of symptoms while standing. It is an autonomic nervous system disorder and the symptoms are relieved once the person sits back down. Symptoms include heart. Also known as: POTS, familial orthostatic tachycardia due to norepinephrine transporter deficiency, irritable heart, orhtostatic intolerance, orthostatic intolerance due to NET deficiency, postural tachycardia syndrome due to NET deficiency, soldiers heart.