By Dr. Jennifer Gans
Tinnitus—the perception of sound without an external source—is commonly described as ringing, buzzing, or humming in the ears. While tinnitus is often associated with hearing loss from aging or noise exposure, it is also frequently reported after traumatic brain injury (TBI). In fact, tinnitus is one of the most common sensory symptoms following concussion and other forms of head injury.
Understanding why tinnitus occurs after traumatic brain injury requires looking not only at the ear, but at how the brain processes sound.
Many people think of hearing as something that happens primarily in the ear. In reality, hearing is largely a brain process. The ear collects sound information and sends it to the brain, but it is the brain that interprets and gives meaning to those signals.
After a traumatic brain injury, several parts of this system can be disrupted. Even when the ear itself is structurally intact, the injury may affect:
When these systems are disrupted, the brain’s normal balance between incoming signals and internal neural activity can change.
The brain relies on steady sensory input from the ear. When that input changes—even slightly—the brain may attempt to compensate.
After traumatic brain injury, this compensation can occur in several ways:
When the brain turns up its internal “gain” to search for missing or altered input, neural activity that would normally remain unnoticed can become perceptible. The brain essentially begins to notice its own internal auditory signals.
That perception is tinnitus.
For some individuals, tinnitus after traumatic brain injury becomes more than just a sound. It can become a source of anxiety, frustration, or difficulty concentrating.
This often occurs because tinnitus interacts with brain systems that are already sensitive after injury.
Traumatic brain injury can affect:
When the brain is already working harder to regulate these systems, an unfamiliar internal sound can be interpreted as something important or threatening. Once the brain labels the signal as a potential threat, attention naturally locks onto it.
The more the brain monitors the sound, the more noticeable it can become.
Fortunately, the brain is highly adaptable. One of its most powerful abilities is neuroplasticity—the capacity to reorganize and adjust its activity over time.
In many cases, tinnitus after traumatic brain injury becomes less intrusive as the brain gradually recalibrates. This process often involves several shifts:
When the brain learns that the sound is not a threat, it can gradually move tinnitus back into the background of awareness.
One of the most powerful tools for people experiencing tinnitus after traumatic brain injury is accurate understanding.
Without clear explanations, the brain may interpret tinnitus as a sign of ongoing damage or danger. This interpretation can increase vigilance and anxiety, which in turn keeps attention locked onto the sound.
But when individuals understand that tinnitus is a benign internal signal created by the brain’s auditory system, the nervous system often begins to relax. As fear decreases, attention naturally softens, allowing the brain’s normal filtering systems to return.
Over time, tinnitus may become far less noticeable.
Tinnitus following traumatic brain injury can be unsettling, especially when it appears suddenly after a concussion or head injury. But it is important to remember that tinnitus reflects the brain’s response to changes in sensory input, not necessarily ongoing harm.
The brain is constantly learning and adapting. With time, support, and accurate understanding of what tinnitus represents, many people find that the sound gradually loses its importance and moves into the background of daily life.
In this way, tinnitus after traumatic brain injury is not only a challenge—it is also a reminder of the brain’s remarkable capacity to adjust, reinterpret, and heal.