A cat drooling suddenly may be caused by an illness that causes oral or digestive tract diseases. You should seek medical attention promptly. When an owner strokes a cat's face, it may also stimulate their salivary glands, causing the cat to drool.

Caused by illness

Oral diseases, digestive tract diseases, and some viral infections can cause cats to drool. If you can’t determine why your cat is drooling, you’d better take your cat to a pet hospital for a checkup.

Some owners will be intimate with their cats for a while before meals. Over time, the cats will develop a conditioned reflex to eat food after being intimate with their owners, so every time you are intimate with them, they will know that after a while Now that I can eat, my saliva will flow out involuntarily.

It turns out that cats are most likely to drool when they lie on their owners' laps. The principle is the same as when people drool when sleeping on the table. The salivary glands are stimulated and cause saliva to flow out.