Hives (urticaria) are raised, itchy welts caused by mast cells in your skin releasing histamine and other mediators in response to allergens, medications, infections, stress, or sometimes unknown triggers. Histamine makes nearby blood vessels leak fluid into surrounding tissue, creating the characteristic swollen, red or pale bumps. Your mast cells are immune sentinels designed to trigger rapid inflammatory responses to threats—but they can activate inappropriately. The organism-as-team view shows hives as immune hypersensitivity: your mast cells detect triggers (via IgE antibodies or direct activation), they degranulate releasing histamine, bradykinin, and other inflammatory mediators, your blood vessels become permeable (leaking fluid), sensory nerves detect this activity (causing itch), and usually within hours, your body reabsorbs the fluid and hives resolve. Chronic hives may involve autoantibodies that inappropriately activate mast cells even without external triggers. Supporting your skin immune team means identifying and avoiding triggers when possible, using antihistamines to block histamine receptors (turning down the alarm response), stress management to reduce mast cell sensitivity, and addressing underlying conditions that might provoke chronic activation. You're helping your mast cells recalibrate their threat assessment, reducing false alarms while maintaining their important protective function when genuinely needed. ⚕️ This protocol does not replace professional consultation.