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Behavior doesn’t just signal illness — it can cause it. Chronic stress from fear, isolation, or conflict changes physiology: elevated cortisol suppresses immunity, disrupts digestion, and even alters heart rhythms. Horses with gastric ulcers often develop cribbing or weaving. Parrots that pluck feathers may have underlying pain — or the plucking itself leads to skin infections. Veterinary treatment that ignores the behavioral trigger is like bailing water from a leaky boat without plugging the hole.