Here are the sounds that cats fear most:
A loud noise: such as thunder, firecrackers, etc.
Sounds made by people: such as shouting, clapping, etc.
Other animal sounds: such as dog barks, mouse squeaks, etc.

Cats have very sensitive hearing, so certain sounds can cause them significant psychological stress. To avoid harming your cat, it's best to keep them away from these sounds. If you find that your cat is particularly sensitive to a certain sound, you can try using earplugs or taking other measures to protect them.