The cat suddenly meows more loudly than before, which may be due to the following five reasons:

1. Remind the owner to feed or clean the cat's litter box. It may be that the owner did not add food or clean the cat's litter box in time, thus If the cat keeps meowing, the owner should prepare enough food and clean the cat litter in time.

2. The cat may keep barking due to discomfort or pain. At this time, the cat should be taken to the veterinary hospital for examination and treatment.

3. Cats will also become meowing and clingy when they are in estrus. The owner should take the cat to breed or neuter it.

4. Environmental changes can easily cause cats to become restless. If the owner has recently moved or a new member has arrived in the house, the cat will easily scream at night. The owner should comfort the cat more.

5. There is a lack of space for cats to play. After a long time, the cat will feel very stale. At this time, the cat will keep barking, so you can interact with the cat more.