According to Paw Nation, hamsters make a variety of noises to communicate with their human owners. While hamsters don't cry like human babies, they can scream, squeal or squeak in response to stress.
Hamsters most commonly vocalize when they experience pain or fear, making it especially important to pay attention to a hamster's behavior, as it can indicate sickness or injury. Syrian hamsters also vocalize when confronted by other hamsters, as a warning or a sign of aggression. This is because they are solitary animals, unlike dwarf hamsters, which prefer to live in packs. Some hamsters vocalize often, and others are relatively silent.