Isolated sneezes often come from dust, litter powder, or odors; with scant clear discharge and normal energy and appetite, improve the environment and watch for a day or two.
Persistent sneezing, yellow-green discharge, one-sided blockage, or blood raises infection, foreign body, polyp, or tumor possibilities that need veterinary examination.
In kittens and group housing, sneezing often relates to upper respiratory infections like herpesvirus or calicivirus, frequently with conjunctivitis and mouth ulcers; seek care early.
Never use human cold medicines or nasal drops at home, as many ingredients harm cats; humidifying the air and cutting dust are safe supportive steps.
