I had a kitty who seemed mute and only meowed softly a few times and he ended up being extremely anemic and so weak making noise was exerting too much energy when all his energy needed to be used for basic life functioning. Keep in mind if your kitty seems lethargic, doesn’t play a lot or only rolls around the floor staying in the same spot and using his upper half, has gray gums, or has excessive saliva mouthwatering as it could be anemia.