Parents and teachers may have found this maddening - children who have strong aversiveness to sounds that they flee the classroom, birthday parties, baseball games, and movie theatres, but perplexed expressions from audiologists who tell them that their child's hearing is completely normal. In our clinic was see auditory aversive (want to escape) behaviors in many conditions (for instance premature birth, CAPD, mild birth injury, autism spectrum disorders). In these paired studies, it becomes clearer why audiology tests didn't explain behaviors.
For many different reasons, children can develop fight-or-flight reactions to sound that result from the brain overactivation of brain regions like the amygdala. Because different conditions can cause this, there are probably different ways this miswiring or misactivation occurs. In the figure below, see how much more cortical activation children with auditory sensitivity have with sound. Their auditory cortex overreacts to sound stimuli - no wonder it causes panic and danger reactions.
True Hyperacusis: Lowered hearing thresholds
Odynocusis: Lowered auditory pain threshold
Auditory Allodynia: Aversion or fear of sounds not normally aversive
Auditory Attractions: Attractions to or fascinations with certain sounds
Williams Hyperacusis and Sound Aversion pdf
Williams, fMRI, Amygdala pdf