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Many people leave a hearing assessment with a sheet of paper full of symbols, lines, and numbers, but little understanding of what they actually mean. The audiogram is one of the most important tools in audiology, yet it is often misunderstood. Some patients focus on whether their results are “good” or “bad”. Others compare their graph to a friend’s and wonder why their hearing experiences seem completely different despite similar-looking results.
An audiogram is not simply a scorecard. It is a map of how your ears respond to different sounds across a range of pitches and loudness levels. Understanding how to read that map can help you make sense of conversations with your audiologist, understand recommendations for treatment or hearing aids, and appreciate why hearing challenges occur in specific situations.
The Two Main Measurements: Pitch and Loudness
Every audiogram is built around two key elements: frequency and intensity.
Frequency refers to the pitch of a sound and is measured in Hertz (Hz). Lower frequencies represent deeper sounds, such as a bass guitar, distant thunder, or a man’s lower-pitched voice. Higher frequencies represent sharper sounds, such as birdsong, children’s voices, or consonants like “s”, “f”, and “th”.
On an audiogram, frequencies are displayed horizontally across the top of the chart, typically ranging from 250 Hz to 8000 Hz. Moving from left to right means moving from lower-pitched sounds to higher-pitched sounds.
Intensity refers to loudness and is measured in decibels hearing level (dB HL). This scale runs vertically down the chart. Sounds near the top are very soft, while sounds lower down are louder.
One aspect that often surprises patients is that hearing works in reverse on the vertical axis. Better hearing appears higher on the graph, while poorer hearing appears lower. A threshold of 10 dB HL represents softer sounds being detected than a threshold of 50 dB HL.
The points plotted on the audiogram represent the softest sounds you could hear at each frequency during testing.
Understanding the Symbols
Most audiograms use standard international symbols to represent each ear.
The right ear is usually marked with a red circle (O).
The left ear is usually marked with a blue cross (X).
These symbols are connected by lines to make the overall hearing pattern easier to visualise.
Additional symbols may appear when bone conduction testing is performed. Bone conduction bypasses the outer and middle ear and assesses how well the inner ear responds to sound. These symbols help audiologists determine whether hearing loss originates in the outer ear, middle ear, inner ear, or a combination of these areas.
Although the chart can initially appear technical, most audiograms are actually quite simple once you understand that each symbol represents the quietest sound heard at a particular pitch.
What Does “Normal Hearing” Look Like?
Many people assume normal hearing means hearing every sound perfectly. In reality, hearing varies naturally between individuals.
Most audiologists consider hearing thresholds between approximately -10 dB HL and 20 dB HL to fall within the normal hearing range for adults.
On an audiogram, this means the symbols sit close to the top portion of the graph.
Someone with thresholds consistently in this area would generally be expected to hear everyday sounds without significant difficulty under favourable listening conditions.
However, hearing “normally” on an audiogram does not automatically guarantee effortless communication in every situation. Background noise, room acoustics, fatigue, attention, and cognitive factors all influence listening performance.
This distinction is important because hearing and understanding are related but separate processes.
The Different Degrees of Hearing Loss
Audiologists typically classify hearing loss according to the average hearing thresholds measured across key speech frequencies.
Mild hearing loss generally falls between 21 and 40 dB HL.
Moderate hearing loss usually ranges from 41 to 70 dB HL.
Severe hearing loss typically falls between 71 and 90 dB HL.
Profound hearing loss generally exceeds 90 dB HL.
These categories provide useful guidance but should not be viewed as rigid labels.
A person with mild hearing loss may struggle considerably in restaurants or meetings, while another person with moderate hearing loss may cope surprisingly well in many situations.
The location of the hearing loss on the audiogram often matters just as much as its overall severity.
Why High-Frequency Hearing Loss Matters So Much
One of the most common patterns seen in adults is high-frequency hearing loss.
In this situation, hearing may remain relatively good for lower-pitched sounds while declining at higher frequencies.
This pattern often affects speech clarity more than speech volume.
Vowels tend to contain lower-frequency energy and are often still heard reasonably well. Consonants, however, contain much of the detail that makes words distinct from one another.
For example, the words “fit”, “sit”, and “hit” have similar vowel sounds. The consonants at the beginning provide the information needed to tell them apart.
When high-frequency hearing loss develops, people frequently report that they can hear others speaking but cannot always understand what was said.
This is one reason why patients often say, “I can hear people talking, but I can’t make out the words.”
Why Two People With the Same Audiogram Can Hear Differently
This is one of the most important concepts in modern audiology. Two people can have almost identical audiograms yet describe very different listening experiences. The audiogram measures hearing sensitivity in a quiet test environment. Real life is rarely quiet. Restaurants, family gatherings, meetings, television programmes, busy streets, and social events all involve competing sounds that challenge the auditory system.
Factors influencing real-world communication include:
- The brain’s ability to process speech in noise.
- Attention and concentration.
- Listening effort.
- Fatigue.
- Age-related changes in auditory processing.
- Previous hearing experience.
- Language familiarity.
- Memory and cognitive workload.
For this reason, modern hearing assessments increasingly include speech testing, speech-in-noise testing, and detailed discussions about everyday listening situations.
The audiogram provides a crucial foundation, but it is not the entire story.
Why Audiologists Look Beyond the Graph
A good audiologist does not simply look at a line on a chart and recommend a solution.
The audiogram is interpreted alongside symptoms, medical history, lifestyle, communication goals, and additional test results.
Two patients with similar hearing thresholds may receive very different recommendations depending on their needs.
Someone who spends much of their time in meetings may benefit from a different hearing aid strategy than someone who primarily communicates in quieter home environments.
Similarly, symptoms such as tinnitus, ear pressure, dizziness, or sudden changes in hearing may require further investigation regardless of what the audiogram shows.
The graph is an important diagnostic tool, but it is only one part of the overall clinical picture.
Making Sense of Your Hearing Health
An audiogram is often the first step in understanding how your ears respond to sound. Once you know how to interpret the symbols, frequencies, and hearing levels, the chart becomes far less intimidating and far more useful.
The key message is that hearing is about more than volume alone. Pitch, speech clarity, listening environments, and brain processing all play important roles in communication.
If you have recently had a hearing test and are unsure what the results mean, asking your audiologist to walk through the audiogram frequency by frequency can be extremely valuable. Understanding your own hearing profile helps you make informed decisions, recognise changes earlier, and appreciate why certain listening situations may feel more challenging than others.
Ultimately, the goal is not simply to read the lines on the chart. It is to understand what those lines mean for everyday life and how the right support can help you communicate with greater confidence.
