“…A large proportion of patients with JHS also suffer with postural tachycardia syndrome (PoTS), a form of orthostatic intolerance typically presenting with palpitations, dizziness, shortness of breath, and syncope which can occur postprandially and with postural changes. Independent of JHS, the presence of PoTS is associated with upper GI symptoms such as nausea, vomiting and bloating, and GI dysmotility . No existing studies involving upper GI physiology in JHS patients have subtyped them according to PoTS status.…”