Pinellia ternata, commonly known as Ban Xia in traditional Chinese medicine (TCM), has long been used in East Asian herbal formulas to support respiratory health. Its traditional use primarily involves addressing issues like phlegm accumulation, cough, and congestion—functions closely associated with the bronchial system. According to classic TCM texts, Pinellia ternata is considered to have properties that "dry dampness" and "transform phlegm", making it a common component in herbal prescriptions for bronchial and respiratory complaints.

While there is a robust tradition of its use, modern scientific validation remains limited. Some pharmacological studies have explored Pinellia ternata’s bioactive compounds, such as alkaloids and glycosides, which may exhibit anti-inflammatory and antitussive effects in animal models. However, these studies are preliminary, often lack rigorous clinical trials in humans, and do not establish clear efficacy or safety for supporting the bronchial system. Furthermore, Pinellia ternata must be processed properly before use, as raw forms contain toxic compounds.

In summary, Pinellia ternata's use for bronchial support is justified by a strong tradition in TCM, but scientific evidence remains insufficient for a higher rating. Caution is advised due to potential toxicity in unprocessed forms.