Waking up one morning and suddenly realizing that you cannot hear normally can be frightening. Sudden hearing loss can occur without pain or warning, making the experience especially alarming. While some causes may be temporary and treatable, sudden hearing loss can also signal a medical emergency that requires prompt evaluation.
Recognizing the possible causes of sudden hearing loss and seeking professional care quickly can make an important difference in treatment and recovery. In this guide, we explain what sudden hearing loss is, what can cause it, and when you should seek immediate medical attention.
What Is Sudden Hearing Loss?
Sudden hearing loss is generally defined as a rapid decrease in hearing that develops over a period of up to 72 hours. It most commonly affects one ear, although both ears can occasionally be involved.
Symptoms can vary from person to person. You may notice:
- Hearing that suddenly sounds muffled or blocked
- A feeling of fullness or pressure in the ear
- Ringing or buzzing, known as tinnitus
- Difficulty understanding speech
- Distorted or unusually quiet sounds
- Dizziness or balance problems
Because several different conditions can produce similar symptoms, professional hearing testing is important to determine the underlying cause.
Sudden Sensorineural Hearing Loss (SSHL)
Sudden sensorineural hearing loss (SSHL) is one of the most important causes to identify quickly. It occurs when there is a sudden disruption involving the inner ear, cochlea, hearing nerve, or related neural pathways.
In many cases, the exact cause cannot be identified. Possible contributing factors may include:
- Reduced blood flow to structures involved in hearing
- Inflammation affecting the inner ear or auditory pathways
- Viral or other infections
- Disruption of normal nerve signaling
- Autoimmune activity affecting the inner ear
SSHL requires prompt medical assessment because treatment may be more effective when started early. If you experience a sudden unexplained decrease in hearing, do not assume it is simply earwax or congestion.
Infection-Related Hearing Changes
Certain infections can affect the structures responsible for hearing and may lead to temporary or persistent hearing changes. Hearing symptoms may develop during an illness or shortly afterward.
Possible infections associated with hearing changes include:
- Viral upper respiratory infections
- Influenza
- Herpes-family viruses
- Other viral illnesses, including some reported cases associated with COVID-19
Infection-related hearing changes may occur alongside symptoms such as ear pressure, tinnitus, or dizziness. A hearing evaluation can help determine whether the problem involves the outer, middle, or inner ear.
Head or Ear Trauma
Injuries to the head or ear can affect hearing and should be evaluated promptly, particularly when hearing changes occur immediately after the injury.
Potential causes include:
- Concussions or significant blows to the head
- Sudden changes in air pressure, such as those associated with barotrauma
- Exposure to extremely loud sounds
- Damage to the delicate structures of the inner ear
- Changes involving the fluid-filled structures of the inner ear
Even when an injury initially seems minor, a sudden change in hearing should not be ignored.
Could Earwax Cause Sudden Hearing Loss?
Impacted earwax is a common and generally treatable cause of conductive hearing loss. Because it can develop relatively quickly, earwax blockage may feel similar to more serious forms of sudden hearing loss.
Earwax buildup may cause:
- A sudden sensation of blocked or muffled hearing
- Fullness or pressure in the ear
- Hearing loss primarily affecting one ear
- Improvement after the impacted wax is safely removed
However, it is difficult to determine the cause of sudden hearing loss at home. Assuming that hearing loss is caused by earwax could delay treatment for a more serious inner-ear condition.
Do not use a Q-Tip or another object to investigate or remove the blockage. A professional examination can determine whether earwax is actually responsible.
Other Possible Causes of Sudden Hearing Changes
Sudden or rapidly developing hearing loss can have many potential causes. Depending on your symptoms and medical history, your healthcare provider may also consider:
- Certain medications that can affect hearing
- Vascular or circulatory problems
- Autoimmune disorders affecting the inner ear
- Conditions involving the hearing nerve
- Rarely, tumors or other abnormalities affecting the auditory nerve
A comprehensive hearing evaluation and medical examination can help identify the cause and determine the appropriate next steps.
Why Prompt Evaluation Matters
The most important thing to remember about sudden hearing loss is not to wait and see if it improves on its own.
Prompt evaluation can help:
- Determine whether the hearing loss is conductive or sensorineural
- Identify potentially reversible causes
- Guide timely treatment when appropriate
- Reduce the risk of prolonged hearing difficulties
- Establish a baseline for monitoring recovery
A hearing test can provide valuable information about the type and severity of hearing loss, while a medical evaluation can help determine whether additional testing or treatment is necessary.
When Should You Seek Emergency Hearing Care?
Seek prompt medical attention if you experience:
- Sudden hearing loss in one or both ears
- Sudden hearing loss accompanied by dizziness or balance problems
- New or sudden tinnitus
- A sudden sensation of ear pressure or fullness
- Hearing loss following a head injury or significant noise exposure
- Sudden hearing changes during or after an illness
Even if your hearing partially returns, you should still have it evaluated. Temporary improvement does not necessarily mean that the underlying problem has resolved.
How Is Sudden Hearing Loss Diagnosed?
A hearing professional will begin by examining your ears and reviewing your symptoms, medical history, recent illnesses, medications, noise exposure, and any injuries.
Hearing tests can help determine whether the hearing loss is:
- Conductive, involving the outer or middle ear
- Sensorineural, involving the inner ear or hearing nerve
- Temporary or potentially permanent
- Mild, moderate, severe, or profound
Additional medical testing may be recommended depending on the results and suspected cause.
The sooner the type and severity of hearing loss are identified, the sooner an appropriate treatment plan can be considered.
Protect Your Hearing and Seek Care Promptly
Sudden hearing loss can be unsettling, but taking action quickly is one of the best things you can do. While earwax or congestion can sometimes cause temporary hearing changes, sudden hearing loss may also indicate a condition