There shouldn't be any growling or hissing sounds, which could indicate more serious forms of aggression due to physical pain or injury. [substeps] If your cat is exhibiting aggression and you don't know if it is play aggression or aggression due to a serious illness, you should get it checked out by a veterinarian.
[header] How to stop a cat from biting or scratching during play [title] Recognize play aggression. [step] If your cat's ears flatten, its tail flickers and it stares at you, it may be exhibiting play aggression. However, it shouldn't look like your cat is in pain.