Allergic rhinitis, commonly referred to as hay fever, is a chronic inflammatory condition affecting the nasal passages and upper respiratory tissues in response to environmental allergens such as pollen, dust, mold particles, and airborne irritants. The condition is characterized by repeated sneezing, nasal congestion, sinus pressure, watery eyes, mucus production, throat irritation, and heightened sensitivity within the respiratory tract. Histamine release, inflammatory cytokine signaling, oxidative stress, and epithelial irritation are central biological patterns involved in this condition. The nasal lining acts as a protective barrier between inhaled particles and the immune system. Repeated exposure to airborne irritants can stimulate immune signaling pathways associated with mast cell activation, histamine synthesis, leukotriene signaling, and inflammatory mediator release. Elevated inflammatory signaling may contribute to swelling of nasal tissues, increased mucus secretion, airway irritation, and chronic sinus discomfort. Oxidative stress generated by environmental toxins and pollution may further aggravate epithelial tissues and contribute to inflammatory burden. A whole-food plant-based dietary pattern emphasizing colorful fruits, vegetables, herbs, legumes, mushrooms, seeds, and polyphenol-rich foods may help support normal inflammatory balance and antioxidant defense systems. Foods naturally rich in flavonoids, carotenoids, phenolic acids, and sulfur-containing compounds have been studied for their relationship to immune signaling, histamine modulation, oxidative balance, and epithelial support. Citrus fruits, berries, leafy greens, broccoli, onions, green tea, ginger, turmeric, garlic, parsley, and cruciferous vegetables contain compounds associated with support for respiratory tissues and inflammatory regulation. Plant fibers and polyphenols also interact with gut microbiome signaling pathways, which influence immune activity and systemic inflammatory tone. Fermentable fibers from legumes, vegetables, oats, and whole grains contribute to short-chain fatty acid production that supports epithelial integrity and immune communication. Diets high in processed foods, excess saturated fats, additives, smoke exposure, and environmental toxins may contribute to increased inflammatory signaling and oxidative burden. Hydration status, antioxidant intake, mineral balance, and dietary phytochemical diversity are all associated with respiratory tissue resilience and healthy immune responsiveness. Foods containing quercetin, luteolin, kaempferol, vitamin C, carotenoids, and sulfur compounds have been investigated for their relationship to inflammatory mediator activity and upper airway support. Consistent intake of diverse whole plant foods may help support nasal tissue integrity, antioxidant defenses, and balanced immune signaling pathways associated with allergic rhinitis.