IL1A and pneumonia: It reduces the production of proinflammatory cytokines, Interleukin-1a (IL-1a), and leukocyte recruitment.   <b>Methods:</b> A comprehensive literature search was conducted using PubMed, Scopus, Embase, CINAHL, and Google Scholar, with keywords such as "radiotherapy," "low-dose radiation therapy," "low-dose irradiation," "covid-19 pneumonia," "SARS-CoV-2 pneumonia," and "covid pneumonia." with additional filters for human studies and customized articles in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses.