Jie Geng (桔梗) — Balloon Flower Root | TCM Lung & Throat Herb Guide

At a Glance

Herb: Jie Geng
Chinese name: 桔梗 (Jié Gěng)
Latin name: Platycodon grandiflorum (Jacq.) A.DC.
Nature: Neutral
Taste: Bitter / Acrid
Meridian: Lung
Category: Herbs that Transform Phlegm and Stop Coughing
Introduction: Jie Geng (桔梗), balloon flower root (Platycodon grandiflorum), is the quintessential lung-directing herb in TCM — its upward and outward action makes it a ‘carrier’ that guides other herbs to the lung. Entering the Lung channel, it opens the lung qi, transforms phlegm, and relieves sore throat. Classical physicians called it ‘舟楫之剂’ (the vessel herb — a boat that carries other medicines upward to the lung). It is one of the most universally combined herbs, appearing in formulas for cough, throat, lung abscess, and as an upward-guiding agent. Its saponins (platycodin D) account for expectorant, anti-inflammatory, and mucosal protective actions.

Opens the lung and transforms phlegm (宣肺化痰): the primary action — opens constrained lung qi and promotes expectoration of phlegm.
Benefits the throat and expels pus (利咽排脓): treats sore throat, hoarse voice, and pulmonary/pharyngeal abscess.
Carries other herbs upward (载药上行): guides formula action to the upper burner and lung — a messenger herb function.
Raises lung qi to promote bowel movement (升提): paradoxically, by raising lung qi, it helps the lung’s descending function regulate the large intestine.

Cough with phlegm: both wind-cold (white phlegm) and wind-heat (yellow phlegm) types — opens lung qi to facilitate expectoration.
Sore throat and loss of voice: wind-heat throat pain, pharyngitis, laryngitis — classic with Gan Cao (Jie Geng Tang / Gan Jie Tang).
Lung abscess: combines with Yu Xing Cao, Gua Lou, Yi Yi Ren for purulent sputum.
Chest oppression: lung qi stagnation with chest tightness — opens and diffuses.
Upper body guiding: used in small amounts to direct formulas to the throat, chest, and lung — a formulaic tool rather than standalone treatment.

Hemoptysis: use cautiously — upward-dispersing action may aggravate bleeding.
Yin deficiency cough: not ideal alone — ascending action without nourishing may worsen dry cough; combine with yin-nourishing herbs.
Gastric irritation: saponins may cause nausea and vomiting on empty stomach — take with food.
Standard dose: 3–10g in decoction. Small doses (1–3g) used as a guiding herb without significant independent effect.

桔梗汤 (Jie Geng Tang) / 甘桔汤 (Gan Jie Tang): Jie Geng + Gan Cao — the simplest throat formula from 《金匮要略》; sore throat from lung heat or cold.
银翘散 (Yin Qiao San): Jie Geng + Jin Yin Hua + Lian Qiao — wind-heat exterior pattern with sore throat and cough; the premier wind-heat formula.
参苓白术散 (Shen Ling Bai Zhu San): Jie Geng raises lung qi to assist spleen transportation — an elegant formula design.
苇茎汤 (Wei Jing Tang) variant: Jie Geng + Yi Yi Ren + Gua Lou — lung abscess treatment.

For wind-heat attacking lung with cough and sore throat: combine with Sang Ye, Ju Hua, Xing Ren (Sang Ju Yin).
For wind-cold with cough: combine with Xing Ren, Zi Su Ye, Chen Pi.
For lung abscess with purulent sputum (classical formula): combine with Gan Cao (Jie Geng Tang).
For sore throat with loss of voice: combine with Gan Cao, Bo He, Niu Bang Zi.
For phlegm obstruction with chest fullness: combine with Zhi Ke, Gua Lou, Ban Xia.
Carrier herb: raises other herbs to the upper body — combine with Niu Xi to direct downward, or use alone to direct upward.
For tonsillitis: combine with She Gan, Shan Dou Gen, Gan Cao.

platycodin D
- Expectorant: stimulates respiratory mucus secretion, thins viscous phlegm
- Antitumor: induces apoptosis in lung and colon cancer cells
Anti-inflammatory
- inhibits COX-2, reduces prostaglandin and cytokine production
Antibacterial
- active against Staphylococcus, Streptococcus, and respiratory pathogens
Antitussive
- reduces cough reflex via central and peripheral mechanisms
Hepatoprotective
- reduces liver enzyme elevation and lipid peroxidation
Hypoglycemic
- improves insulin sensitivity and reduces postprandial glucose

Shen Nong Ben Cao Jing (《神农本草经》): ‘Governs chest and hypochondrial pain like knife stabbing, abdominal fullness, deep borborygmus, and fright palpitations with racing qi.’
Ben Cao Gang Mu (《本草纲目》): ‘Governs mouth and tongue sores, and red swollen painful eyes.’
Ben Cao Jing Shu (《本草经疏》): ‘Examining the conditions Platycodon Root governs, its nature should be acrid, bitter, and sweet, balanced and slightly warm; ascending and yang; enters the Hand Tai Yin and Shao Yin, and Foot Yang Ming channels.’
Yi Xue Zhong Zhong Can Xi Lu (《医学衷中参西录》): ‘Platycodon Root is hollow in substance and naturally inclined to ascend, also possessing an opening and unblocking force — hence it can guide the force of other medicinals to reach upward into the chest, treating all diseases of the chest and Lung.’