Pain is an under-recognized driver of cat suddenly confused behavior, especially in seniors with arthritis, dental disease, constipation, or urinary discomfort. Pain changes how the brain filters information: a cat may startle, swat, hide, or seem unable to settle because every movement carries a threat. Unlike dogs, cats often do not limp dramatically; instead, they reduce jumping, change sleeping spots, or become unusually protective of a body area. Pain can also raise blood pressure, which means a painful episode can indirectly increase risk for hypertensive complications.
UNIQUE MISCONCEPTION: “If the cat is eating, it can’t be in serious pain.” Many cats keep eating while painful, then show confusion-like behavior when touched, lifted, or approached. Watch for small tells: a stiff back end on stairs, reluctance to be brushed, sudden growling when picked up, or missing the litter box because squatting hurts. If confusion episodes cluster around handling, grooming, or litter box trips, pain deserves to be near the top of the list.