Misphonia is a condition which causes the sufferer to feel rage and panic when they hear mouth sounds, like those caused by eating and drinking. It can be socially isolating, of course. From a New York Times article about the affliction by Joyce Cohen:

“He believes the condition is hard-wired, like right- or left-handedness, and is probably not an auditory disorder but a ‘physiological abnormality’ that resides in brain structures activated by processed sound.

There is ‘no known effective treatment,’ Dr. Moller said. Patients often go from doctor to doctor, searching in vain for help.

Dr. Johnson agreed. ‘These people have been diagnosed with a lot of different things: phobic disorders, obsessive-compulsive disorder, bipolar, manic, anxiety disorders,’ she said.

Dr. Johnson’s interest was piqued when she saw her first case in 1997. ‘This is not voluntary,’ she said. ‘Usually they cry a lot because they’ve been told they can control this if they want to. This is not their fault. They didn’t ask for it and they didn’t make it up.’ And as adults, they ‘don’t outgrow it,’ she said. ‘They structure their lives around it.’

Taylor Benson, a 19-year-old sophomore at Creighton University in Omaha, says many mouth noises, along with sniffling and gum chewing, make her chest tighten and her heart pound. She finds herself clenching her fists and glaring at the person making the sound.

‘This condition has caused me to lose friends and has caused numerous fights,’ she said.” (Thanks Marginal Revolution.)