Editor’s Note: Part 1 of this article (October issue) discussed the definition, diagnosis and clinical presentation of postural orthostatic tachycardia syndrome (POTS).
Part 1 of this article introduced POTS as a form of dysautonomia defined by orthostatic tachycardia, yet marked by significant variability in clinical presentation. While the diagnosis is unified by heart rate criteria, the mechanisms driving POTS are not uniform. This distinction is critical for practitioners using Chinese herbal medicine, as failure to differentiate underlying mechanisms may lead to ineffective treatment or worsening of symptoms.
POTS is best understood not as a single disease, but as a syndrome arising from distinct failures of physiological regulation. Western medicine increasingly recognizes three primary mechanisms involved: neurogenic, hypovolemic and hyperadrenergic POTS. Although overlap is common, each reflects a fundamentally different regulatory problem.
Importantly, these distinctions map cleanly onto classical TCM pattern logic when viewed through a functional rather than purely symptomatic lens.
Treating the Label vs. Treating the Mechanism
A common clinical pitfall is attempting to “treat POTS” with a single strategy – without first determining why tachycardia is occurring. Biomedically, orthostatic tachycardia may reflect compensatory cardiac responses to impaired vasoconstriction, low circulating volume or excessive sympathetic activation. In TCM terms, it may arise from instability of regulation, deficiency of capacity or loss of inhibitory control.
When these distinctions are not made, herbal formulas may worsen symptoms. Strong tonification or warming herbs can exacerbate hyperadrenergic states. Anchoring formulas may deepen fatigue in hypovolemic patients. Although vasomotor support is often necessary in neurogenic POTS, unmodulated or prematurely applied vasomotor-enhancing strategies may overwhelm individuals with autonomic neuropathy if rhythmic stability has not first been restored.
Understanding the existence of distinct POTS mechanisms, and learning to differentiate them, is therefore foundational when using herbs.
Neurogenic POTS: Impaired Peripheral Vasoconstriction
Neurogenic POTS is characterized by impaired peripheral vasoconstriction due to partial autonomic neuropathy affecting the lower extremities. Blood pools in the legs upon standing, reducing venous return and prompting a compensatory rise in heart rate. Blood volume may be normal or mildly reduced, and blood pressure may remain relatively stable. Patients commonly report leg pain, cramping, shaking, cold feet, or discoloration related to peripheral autonomic dysfunction.
From a TCM perspective, this presentation includes instability of heart qi and heart yang, particularly in their role of governing circulation and rhythmic coordination. Rather than a lack of substance, there is impaired regulation. Patients may present with palpitations, fatigue, exercise intolerance, and marked heart rate variability without significant heat or sweating.
In these cases, aggressive tonification or forceful vasoconstriction often fails. Instead, formulas that restore rhythmic integrity are more appropriate. Zhi Gan Cao Tang is particularly relevant, as it was classically indicated for irregular pulse and weakness following damage to qi and yin. Clinically, it often improves orthostatic tolerance by stabilizing autonomic rhythm rather than forcing vascular tone.
Once heart rate stability improves, formulas that support nerve health and circulation, such as Huang Qi Wu Wu Tang or Bu Yang Huan Wu Tang, may be introduced gradually at small doses. This mirrors biomedical understanding that neurogenic POTS is not primarily a volume problem, but one of impaired autonomic-mediated vasoconstriction.
Hypovolemic POTS: Insufficient Capacity and Fluid Regulation Failure
Hypovolemic POTS is driven by reduced effective circulating blood volume, often accompanied by paradoxically low renin and aldosterone levels. Tachycardia is compensatory, reflecting reduced preload and stroke volume. These patients are often profoundly intolerant of heat, exertion and fluid loss.
In TCM terms, hypovolemic POTS aligns with qi and yin deficiency involving the lung-spleen-kidney axis, resulting in impaired generation, distribution, and conservation of body fluids. Secretomotor symptoms, such as spontaneous sweating, abnormal sweating patterns, thirst, or dryness, are often prominent.
Importantly, absence of sweating does not necessarily indicate adequate fluids; in depleted patients, it may reflect protective shutdown. Patients may feel internally hot while the skin remains cool, reflecting yin-deficient heat with failure to regulate opening and closing of pores.
Sheng Mai San is particularly well suited to this pattern. Rather than merely “astringing,” the formula restores sufficient qi and yin to allow regulated output. Clinically, patients often report improved heat tolerance, reduced postural symptoms and greater resilience to exertion.
In hypovolemic POTS, both excessive vasoconstriction and vasodilation may worsen symptoms if applied prematurely, as the primary issue is insufficient circulating volume rather than vascular tone. Distinguishing hypovolemic from neurogenic POTS is critical.
While both present with tachycardia, hypovolemic POTS reflects inadequate circulating volume and fluid regulation, whereas neurogenic POTS reflects impaired autonomic-mediated vasoconstriction – two very different treatment problems. While both may be present in the same individual, it helps to identify which is more severe.
Hyperadrenergic POTS: Excessive Sympathetic Drive
Hyperadrenergic POTS is defined by excessive sympathetic activation, often evidenced by elevated norepinephrine levels and increased blood pressure upon standing. Patients frequently report tremor, internal vibration, anxiety, migraines, insomnia, sensory hypersensitivity, and exaggerated stress responses. From a TCM perspective, this corresponds to shao yang dysregulation, liver qi constraint, and failure to anchor yang, often with disturbance of the shen.
These patients are not primarily deficient; rather, they lack adequate inhibitory control. Strong tonification or overly warming formulas may exacerbate agitation.
Formulas such as Chai Hu Jia Long Gu Mu Li Tang exemplify the appropriate principle: regulation and anchoring rather than suppression. By calming excessive responses while preserving adaptability, such formulas may reduce adrenergic reactivity and improve sleep and stress tolerance. This approach parallels biomedical strategies aimed at restoring autonomic inhibitory control, not merely lowering heart rate.
Overlap Is Common; Sequencing Is Everything
Many patients exhibit mixed features rather than pure subtypes. Hypovolemia may underlie hyperadrenergic reactivity, or neurogenic vasomotor failure may coexist with sympathetic surges. In these cases, sequencing treatment correctly is more important than selecting a single “perfect” formula.
Clinical Pearls
POTS is not a single pattern. Although united by orthostatic tachycardia, neurogenic, hypovolemic, and hyperadrenergic POTS represent distinct regulatory failures, each requiring different treatment principles. Traditional Chinese medicine is uniquely suited to address this complexity when pattern differentiation is applied with precision.
Rather than asking which formula treats POTS, the more useful question is: Which regulatory failure is driving this patient’s symptoms right now? When that question is answered correctly, herbal medicine becomes not only effective, but also a powerful example of truly targeted, individualized care.
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