NLRP3 and viral pneumonia: Keyword combinations included “viral pneumonia,” “Traditional Chinese Medicine,” “natural products,” “inflammation,” and “oxidative stress,” in addition to mechanism-related terms such as “NF-κB,” “Nrf2,” “PI3K/Akt,” “MAPK,” and “NLRP3 inflammasome.” Natural compounds acting on these pathways have been shown to suppress cytokine storms, reduce reactive oxygen species accumulation, preserve alveolar epithelial integrity, and alleviate pulmonary inflammation.