Pyrrosia, a genus of fern commonly used in traditional Chinese medicine (TCM), is primarily employed for conditions involving the urinary tract, such as promoting urination and relieving damp-heat. Its TCM name is Shi Wei (石韦). Historically, Pyrrosia is not directly associated with the treatment of chills as a primary indication. However, in TCM theory, chills are sometimes considered a manifestation of exterior syndromes (such as wind-cold), and certain herbs may be included in formulas to address underlying patterns contributing to chills. Pyrrosia is occasionally included in such formulas, but its role tends to be secondary, with its main function being to clear heat and promote urination rather than to directly "treat chills." There is no well-documented scientific or clinical evidence to support the use of Pyrrosia specifically for chills, nor is it a prominently listed traditional remedy for this symptom in classical materia medica. Thus, its use for chills is based more on traditional association with broader syndrome patterns rather than direct treatment. Modern pharmacological studies have focused on its anti-inflammatory, diuretic, and antioxidant properties, but not on mechanisms relevant to chills or thermoregulation. Consequently, support for Pyrrosia's use in treating chills is limited and rooted mostly in tradition, with a low level of direct evidence.