There are three types or categories of APD (BSA, 2018)
1 Developmental APD
Cases presenting in childhood with listening difficulties, but with normal audiograms and no other known aetiology (causes) or potential risk factors other than a family history of developmental communication and related disorders. These individuals may retain APD into adulthood.
2 Acquired APD
Cases associated with a known medical or environmental event (e.g. brain lesion, trauma, illness, noise or ageing).