Urticaria, or hives, often links to allergies, manifesting as red, itchy welts on the skin. Allergic reactions to foods, pollen, or medications like cephalexin a common antibiotic can trigger urticaria. When the immune system overreacts, histamine release causes these skin symptoms. Acute urticaria may resolve quickly, but chronic cases persist beyond six weeks, sometimes without clear allergic triggers. Identifying allergens through testing is key to management. Antihistamines, corticosteroids, or avoiding triggers like cephalexin help control outbreaks. Understanding this connection empowers patients to manage symptoms effectively, reducing discomfort and preventing severe reactions like anaphylaxis.