Baphicacanthus cusia, commonly known as indigo woad root or "Qing Dai" in traditional Chinese medicine (TCM), has been used historically for its anti-inflammatory and detoxifying properties. In TCM, it is included in various herbal formulas to treat conditions associated with heat, toxin accumulation, and inflammation, which sometimes include upper respiratory tract infections and allergic reactions. While rhinitis—particularly allergic rhinitis—is not a classic TCM diagnosis, symptoms such as nasal congestion, sneezing, and runny nose are often addressed with herbs like Baphicacanthus cusia as part of broader symptom management. However, there is very limited direct scientific evidence supporting the efficacy of Baphicacanthus cusia specifically for allergic rhinitis. Most available studies and reviews reference its usage in the context of general anti-inflammatory or antiviral activity, and not specifically for allergic rhinitis. The few laboratory studies that exist pertain primarily to its immunomodulatory effects or applications in dermatology (such as psoriasis), not respiratory allergies. Thus, while its use for allergic rhinitis is rooted in traditional practice, robust clinical data to support this indication is lacking. The traditional rating for evidence is low (1/5), reflecting historical usage without modern scientific validation for this specific condition.