Pendred Syndrome
What is Pendred Syndrome?
Pendred syndrome is a genetic condition that affects both hearing and thyroid function. People with this condition are born with a defect in a protein called pendrin, which plays a role in the inner ear and thyroid gland. This defect leads to hearing loss that usually starts in early childhood and thyroid problems that may develop over time.
The most common thyroid issue in Pendred syndrome is goiter, which means an enlarged thyroid gland. Many people with this condition develop goiter during childhood or their teenage years. Some people also develop hypothyroidism, where the thyroid does not make enough thyroid hormone. The severity of symptoms varies widely from person to person, even within the same family.
Pendred syndrome accounts for about 5 to 10 percent of hereditary hearing loss. It is inherited in an autosomal recessive pattern, meaning both parents must carry the gene mutation. Regular monitoring of thyroid function through blood testing helps manage the condition and prevent complications.
Symptoms
- Hearing loss, often present at birth or developing in early childhood
- Balance problems due to inner ear abnormalities
- Enlarged thyroid gland that may be visible as neck swelling
- Fatigue and low energy levels
- Weight gain despite normal eating habits
- Sensitivity to cold temperatures
- Dry skin and hair
- Difficulty concentrating or brain fog
- Slowed growth in children
Many people with Pendred syndrome have normal thyroid function early in life and show no thyroid symptoms. Hearing loss is usually the first and most noticeable sign. Thyroid problems may not appear until later in childhood, adolescence, or even adulthood.
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Causes and risk factors
Pendred syndrome is caused by mutations in the SLC26A4 gene, which provides instructions for making the pendrin protein. This protein helps transport iodide, a form of iodine that the body needs to produce thyroid hormone. When pendrin does not work properly, iodide cannot move correctly in the inner ear and thyroid gland. This leads to hearing loss and impaired thyroid hormone production.
The condition is inherited in an autosomal recessive pattern. Both parents must carry one copy of the mutated gene, even if they have no symptoms themselves. Each child of two carriers has a 25 percent chance of inheriting both mutated genes and developing the condition. A family history of early hearing loss or goiter increases the risk of Pendred syndrome.
How it's diagnosed
Diagnosis begins with a clinical evaluation that includes hearing tests and imaging of the inner ear. An audiologist will perform hearing tests to determine the type and degree of hearing loss. A CT scan or MRI of the temporal bones can reveal enlarged vestibular aqueducts, a hallmark feature of Pendred syndrome. Genetic testing can confirm mutations in the SLC26A4 gene.
Blood tests are essential for evaluating thyroid function in people with suspected or confirmed Pendred syndrome. Rite Aid offers testing for TSH and T4 at Quest Diagnostics locations nationwide. Elevated TSH levels indicate the thyroid is working hard to maintain hormone production. T4 levels show how much thyroid hormone the body is actually making. Regular monitoring helps catch thyroid problems early and guides treatment decisions.
Treatment options
- Hearing aids or cochlear implants to manage hearing loss
- Thyroid hormone replacement medication when hypothyroidism develops
- Regular monitoring of thyroid function through blood tests every 6 to 12 months
- Iodine intake awareness, as excess iodine may worsen goiter
- Genetic counseling for families planning to have children
- Speech therapy and early intervention services for children with hearing loss
- Surgical removal of thyroid tissue only in rare cases of very large goiter
- Balanced nutrition with adequate selenium and zinc to support thyroid health
- Regular follow-up with an endocrinologist and audiologist
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- Simple blood draw at your nearest lab
- Results in days, not weeks
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Frequently asked questions
The hearing loss results from abnormal development of the inner ear structures, specifically the cochlea and vestibular system. A defective pendrin protein disrupts the fluid balance in the inner ear during development. This leads to progressive or fluctuating hearing loss that can worsen over time, especially after head injuries.
Thyroid problems in Pendred syndrome most commonly appear during childhood or adolescence, but the timing varies widely. Some people develop goiter as early as age 3 to 5 years old. Others maintain normal thyroid function until adulthood or never develop thyroid symptoms at all.
Most doctors recommend thyroid function testing every 6 to 12 months for people with Pendred syndrome. More frequent testing may be needed if you start showing symptoms of hypothyroidism or if your goiter is growing. Regular monitoring helps detect changes early so treatment can begin before symptoms become severe.
There is no cure for Pendred syndrome because it is a genetic condition present from birth. However, both the hearing loss and thyroid problems can be effectively managed with proper treatment. Hearing aids or cochlear implants help with hearing loss, and thyroid hormone replacement treats hypothyroidism when it develops.
Not necessarily. Many people with Pendred syndrome have normal thyroid hormone levels, especially in childhood. Some develop compensated hypothyroidism, where TSH is elevated but T4 remains normal. Others progress to overt hypothyroidism with both elevated TSH and low T4 requiring medication.
Yes, hearing loss in Pendred syndrome often progresses over time, though the rate varies among individuals. Some people experience sudden drops in hearing after head trauma or infections. Others have a slow, gradual decline in hearing ability throughout childhood and adulthood.
An enlarged thyroid, or goiter, may feel like a lump or fullness at the base of the front of your neck. You might notice swelling when looking in the mirror or feel pressure when swallowing or wearing tight collars. Large goiters can sometimes cause difficulty swallowing or breathing.
Diet alone cannot treat Pendred syndrome, but proper nutrition supports thyroid health. Some doctors recommend monitoring iodine intake, as excessive iodine may worsen goiter in some people. Eating foods rich in selenium and zinc may support thyroid function, though medication is usually needed when hypothyroidism develops.
If you have Pendred syndrome and your partner does not carry the gene mutation, your children will be carriers but will not have the condition. If your partner is also a carrier, each child has a 25 percent chance of having Pendred syndrome. Genetic counseling can help you understand your specific risks and testing options.
Regular monitoring catches thyroid problems before they cause serious symptoms or complications. Untreated hypothyroidism can lead to poor growth in children, cognitive difficulties, heart problems, and other health issues. Early detection allows for timely treatment with thyroid hormone replacement, which prevents these complications and improves quality of life.