Superior Semicircular Canal Dehiscence
Superior semicircular canal dehiscence, SSCD for short, is a rare inner ear condition that can cause dizziness, balance problems, and unusual hearing symptoms.
What is superior semicircular canal dehiscence?
Superior semicircular canal dehiscence, SSCD for short, is a rare inner ear condition that can cause dizziness, balance problems, and unusual hearing symptoms. Some people hear their own voice, heartbeat, or even eye movements much louder than normal.
It happens when the bone that normally covers the superior semicircular canal becomes very thin or develops a small opening. SSCD is not considerd to be a common condition.
The semicircular canals are 3 tiny, fluid-filled loops in your inner ear. They help control balance by detecting head movements.
The superior canal sits at the top, and normally, it’s fully enclosed in bone. In SSCD, part of this bony covering is missing. This creates what specialists call a ‘third window’ in the inner ear.
Because of this extra opening:
sound and pressure changes affect the balance system abnormally
signals sent to the brain become distorted
hearing and balance symptoms can overlap
At Welbeck, our ear, nose and throat (ENT) specialists assess and treat patients with SSCD in our dedicated Ear, Nose & Throat centre. If your symptoms are affecting your daily life, we provide expert diagnosis and personalised care in a safe, supportive environment.
More information
Symptoms vary from person to person. Some people mainly notice dizziness, while others are more affected by hearing changes.
Common symptoms include:
dizziness triggered by loud sounds
vertigo caused by coughing, sneezing, or straining
hearing your own voice very loudly (autophony)
hearing your heartbeat or eye movements inside your head
a feeling of fullness or pressure in the ear
sensitivity to sound
losing balance when walking
blurred vision during head movement
Some people find that busy environments, such as supermarkets or train stations, can make their symptoms worse.
Symptoms may develop gradually, or they may become noticeable after a head injury, heavy lifting, or sudden pressure changes.
If you experience sudden hearing loss, severe vertigo, facial weakness, or neurological symptoms, you should seek urgent medical advice.
In many cases, the exact cause is not fully understood.
Possible causes and contributing factors include:
congenital thinning – some people are born with thinner bone over the canal
age-related changes – bone may become thinner over time
head trauma – injury can unmask or worsen an existing thin area
sudden pressure changes – such as heavy straining or barotrauma
Not everyone with thinning develops symptoms. Symptoms usually appear when the opening becomes large enough to disturb inner ear function.
Risk factors
There are no strong lifestyle risk factors. However, SSCD may be more likely to become symptomatic after:
head injury
activities involving repeated straining
significant pressure changes
At Welbeck, diagnosis begins with a detailed consultation with an ENT specialist.
Your consultant will:
ask about your symptoms and when they started
discuss any history of head injury or pressure changes
carry out an ear examination
Because SSCD can mimic other balance disorders, careful assessment is important.
You may need further tests, including:
vestibular evoked myogenic potentials (VEMP) testing
high-resolution CT scan of the temporal bones
A CT scan is particularly important, as it can show thinning or a gap in the bone over the superior canal.
In some cases, your consultant may suspect SSCD based on your symptoms and examination alone, but imaging helps confirm the diagnosis and rule out other causes.
There’s currently no known way to prevent SSCD, especially if it’s related to congenital thinning of the bone.
However, you can reduce the risk of worsening symptoms by:
avoiding heavy straining where possible
protecting your head from injury
seeking medical advice if you develop new balance or hearing symptoms
If you already have symptoms, early assessment may help prevent unnecessary anxiety and guide appropriate management.
SSCD is not life-threatening, but it can significantly affect quality of life.
Possible complications include:
increased risk of falls due to dizziness
anxiety related to unpredictable vertigo
difficulty working in noisy environments
social withdrawal
reduced confidence when driving or exercising
Rarely, if symptoms are severe and untreated, people may avoid normal activities altogether.
The condition does not usually cause progressive neurological damage. However, symptoms can remain persistent without appropriate management.
Treatment depends on how severe your symptoms are and how much they affect your daily life.
Options may include:
monitoring and reassurance – if symptoms are mild
lifestyle adjustments – avoiding triggers such as loud noise or heavy straining
vestibular rehabilitation – specialist balance physiotherapy
hearing protection strategies – in sound-sensitive patients
surgical repair – in severe or disabling cases
Surgery aims to close or plug the affected canal to reduce abnormal sound and pressure transmission. Your consultant will only recommend surgery if the potential benefits outweigh the risks.
At Welbeck, your ENT specialist will discuss all options in detail so you can make an informed decision.
At Welbeck, our ENT specialists are experts in their field and are dedicated to providing world-class care to every patient.
With access to colleagues across other specialties, our consultants are also able to refer within the Welbeck ecosystem if required to ensure you receive the treatment you need as quickly as possible, all under one roof.
All appointments, testing, treatment, and follow-up appointments take place within our state-of-the-art facilities, enabling us to deliver accurate diagnostics and advanced treatments.
Your health is important to us, so we strive to offer same-day appointments whenever possible.
Our consultants are recognised by the major health insurance companies. If you have private health insurance, your treatment at Welbeck can begin once you have obtained authorisation. We also provide care to self-paying patients. Learn more about the different payment options at Welbeck.
Get in touch today to book an appointment.
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Frequently asked questions
SSCD is not usually dangerous, but it can be very disruptive. In severe cases, dizziness and sound sensitivity can interfere with work, travel, and daily activities.
Yes, it can affect one or both ears. Some people have thinning in both canals on scans, but symptoms may only occur on one side.
Changes in air pressure may temporarily worsen symptoms in some people. If you experience significant discomfort when flying, speak to your consultant before travelling.
Although SSCD and Ménière’s disease can both cause dizziness and hearing symptoms, they have different underlying causes and require different treatments. A specialist assessment is important to distinguish between them and ensure you receive the correct treatment.