If you were to rank the sounds that are difficult to hear, then fingernails scratching across a blackboard, subway movements, and long nails scraping walls would definitely be on the list. In everyday life, people will always have varying degrees of phonophobia, which manifests itself as an aversion to specific sounds, but generally does not affect their lives. But why this sound can make people disgusted, what exactly is this caused by the following content to explain to you one by one.