Platycodon, commonly known as balloon flower (Platycodon grandiflorus), has a long history of use in traditional East Asian medicine, particularly within Chinese and Korean herbal practices. Traditionally, the root of Platycodon has been used to treat various respiratory ailments, including cough (especially spastic or productive cough), sore throat, and bronchitis. According to classical Chinese medical texts, Platycodon root (referred to as Jie Geng in Chinese) is believed to "open up" the lungs, facilitate the expulsion of phlegm, and relieve cough by promoting the movement of qi in the chest. Modern pharmacological studies provide some supportive evidence for these traditional uses. Research has identified bioactive compounds in Platycodon, such as saponins (notably platycodin D), which demonstrate expectorant, anti-inflammatory, and antitussive (cough-suppressant) properties in animal models and in vitro studies. Some small clinical studies in Asia suggest Platycodon preparations may help reduce cough frequency and severity, though these studies are generally limited in size, methodology, and often used in combination with other herbs. Overall, while there is a strong basis for its use in traditional medicine and some early scientific support, robust clinical trials specifically targeting spastic cough are limited. Thus, the principal justification for its use remains traditional, with moderate supporting evidence (rating: 3) from pharmacological and limited clinical data.