It is normal for cats to purr while sleeping. This is usually caused by the vibration of the false vocal cords in the cat's throat. This sound may mean that the cat is happy, comfortable, and relaxed. Sometimes, cats may also make this sound when they feel content, relaxed, and relaxed, or after establishing a deep trusting relationship with their owner.

However, if the cat is playing normally, is nervous, or is really asleep Purring may also occur, which may be caused by a respiratory infection virus such as feline bronchitis or feline calicivirus. In addition, if the cat keeps purring no matter what the circumstances, it may be because there is a foreign body in the throat or a throat disease.