How Auditory Processing Disorder Affects Hearing

Auditory Processing Disorder (APD), also known as Central Auditory Processing Disorder (CAPD), is a complex condition that affects the way the brain processes auditory information. Unlike hearing impairments, APD is not caused by a dysfunction in the ability to detect sounds. Instead, individuals with APD have difficulty interpreting sounds, particularly in environments with a lot of background noise. Whereas hearing loss is a decrease in the ability to perceive sounds and can occur as a result of problems with any part of the ear or auditory system.


The Relationship Between APD and Hearing Loss

While APD and hearing loss are unique conditions, they are interrelated in several ways. The effects of one can often mimic or exacerbate the symptoms of the other, and both can significantly impact a person’s ability to communicate effectively. An individual with APD might have normal hearing but still struggle to understand speech, especially in noisy environments. This inability to communicate effectively could easily be mistaken for hearing loss.

A person with a hearing impairment already has difficulty receiving clear signals from the auditory environment. If they were also to have APD, processing these hard to hear sound signals can become even more challenging. Therefore, it is not uncommon for someone with APD to be initially misdiagnosed with hearing loss, or vice versa.


Understanding Auditory Processing Disorder and Hearing Loss

In a typical auditory system, the ears detect sounds and the signals are sent to the brain, which then processes these signals into meaningful information, which we recognize as sound. For individuals with APD, this process is disrupted. The brain struggles to analyze or make sense of the incoming sounds, leading to difficulties in understanding and interpreting what is being heard. 

In contrast, hearing loss can occur when there’s a problem with one or more parts of the ear or the auditory nerve that connects the inner ear to the brain. This can result in a reduced ability to hear soft sounds or difficulty understanding speech even when sounds are loud enough.


Symptoms and Diagnosis

Adults with APD often struggle with understanding speech, particularly in noisy environments. They may find it challenging to follow conversations, especially when multiple people are talking at once. They may frequently ask others to repeat themselves, or they may misunderstand what is being said.

Whereas those with hearing loss may struggle with understanding speech, find it hard to determine where a sound is coming from, and tend to have issues with the volume of sounds.

Diagnosing either APD or hearing loss can be challenging due to the overlap of symptoms and often requires a series of auditory tests conducted by an audiologist. The key is to differentiate between a loss of hearing sensitivity (hearing loss) and problems with sound processing (APD).


Treatment and Management

While there is no cure for APD or most types of hearing loss, there are strategies and therapies that can help manage the symptoms. These may include auditory training exercises like sound therapy, strategies to improve listening skills, and modifications to the listening environment. Hearing aids or cochlear implants can improve the ability to hear sounds for those with hearing loss, but won’t necessarily resolve difficulties with sound processing in those with APD.



Both Auditory Processing Disorder and hearing loss significantly impact an individual’s ability to process auditory information. Understanding the symptoms, differences, and overlap between APD and hearing loss is crucial for developing effective coping strategies and interventions. If you or someone you know is struggling with symptoms of APD or hearing loss, it is important to seek help from a healthcare professional.