Red light therapy (RLT), also known as photobiomodulation (PBM), is emerging as a promising complementary treatment for individuals with autoimmune diseases. This non-invasive therapy uses specific wavelengths of light to stimulate cellular processes, reduce inflammation, and promote healing. Autoimmune diseases, such as rheumatoid arthritis, lupus, multiple sclerosis, and Crohn’s disease, are often characterized by chronic inflammation and tissue damage, and traditional treatments can sometimes be inadequate or come with significant side effects. This article explores the mechanisms by which red light therapy may alleviate symptoms of autoimmune diseases, including pain reduction, immune modulation, improved blood flow, and cellular repair. Although early research supports RLT’s potential to reduce inflammation and enhance healing in various autoimmune conditions, more high-quality clinical studies are needed. The article also discusses the safety, effectiveness, and practical considerations of using RLT, offering insights into its potential role in managing autoimmune disease symptoms alongside conventional treatments.