Thyroid Eye Disease: Why Eyes Bulge and How It Is Treated
Thyroid eye disease (also called Graves' orbitopathy or TED) is an autoimmune condition in which the muscles and fat behind the eye become inflamed and swollen, pushing the eye forward. It most often affects people with Graves' disease (an overactive thyroid). Treatment ranges from thyroid control and anti-inflammatory therapy to surgery in some cases.
By Assoc. Prof. Dr. Preamjit Saonanon, oculoplastic ophthalmologist
What is thyroid eye disease, and why do the eyes bulge?
Your immune system is meant to protect you. In thyroid eye disease, it gets its wires crossed and targets the tissue behind the eyeball: the small muscles that move the eye and the fat that cushions it. These tissues swell.
The eye socket is a bony box with no room to expand. When the contents swell, the only way to go is forward, so the eye bulges. Doctors call this proptosis.
Most people with TED have Graves' disease, but it can also appear when thyroid hormone levels are normal or low. So healthy blood tests do not always mean healthy eyes.
Common symptoms of thyroid eye disease
Symptoms can be mild or severe, and they may affect one eye or both:
Bulging eyes, or a "staring" look because the upper eyelid pulls up
Red eyes and puffy eyelids, often worse in the morning
Dry, gritty, watery eyes or sensitivity to light
An ache or pressure behind the eyes, especially when looking around
Double vision, because swollen eye muscles cannot move freely
Trouble closing the eyes fully
Who is at risk?
TED is most common in people with Graves' disease or another thyroid disorder, and it affects women more often than men. Smoking is the biggest factor you can change: it makes the disease more severe and less responsive to treatment.
Unstable thyroid levels can also make eye symptoms worse, and so can radioactive iodine treatment for the thyroid in some people. If you already have eye symptoms, tell your doctors before starting thyroid treatment.
The two phases of thyroid eye disease
TED usually runs in two phases. The active phase is the inflammatory stage: eyes look red and swollen, and things keep changing. It often lasts from several months up to about one to two years.
Then comes the inactive phase. The inflammation settles, but some people are left with bulging, eyelid retraction or double vision. Knowing which phase you are in matters, because each phase is treated differently.
How is thyroid eye disease treated?
Treatment depends on how active and how severe the disease is. An ophthalmologist usually works together with an endocrinologist (the hormone specialist who manages the thyroid).
Active phase: control the disease and calm the inflammation
The first steps are stable thyroid levels and stopping smoking. Mild cases may only need lubricating eye drops, sunglasses and sleeping with the head raised. For moderate to severe inflammation, a doctor may consider intravenous steroids, other immune-modulating medicines, newer targeted drugs or orbital radiotherapy, depending on the person.
Inactive phase: surgery for what remains
Once the disease has been quiet and stable, usually for at least about six months, surgery may be considered for lasting changes. It is typically done in order: orbital decompression to reduce bulging, eye muscle surgery for double vision, then eyelid surgery to help the eyes close and look more balanced. Not everyone needs every step.
When to see an eye doctor urgently
Seek care right away if your vision gets blurry, colors look washed out, the pain is severe, the bulging gets worse quickly, or you cannot close your eyes and the surface of the eye becomes painful. These can be signs of pressure on the optic nerve or damage to the cornea and need prompt treatment.
Frequently asked questions
Will thyroid eye bulging go away on its own?
Swelling may improve once the disease is controlled during the active phase, but bulging that remains after the disease settles usually does not fully go back. If it affects daily life, surgery may be considered.
My thyroid is under control. Why are my eyes still bulging?
Thyroid eye disease is driven by the immune system inflaming the tissue in the eye socket, so it can follow its own course apart from hormone levels. Thyroid control is still essential, but the eyes may need their own treatment.
Can thyroid eye disease cause blindness?
Most people never reach that point. In severe cases, swollen tissue can press on the optic nerve, or a very dry cornea can ulcerate. See an eye doctor promptly if your vision blurs or colors fade.
Does smoking affect thyroid eye disease?
Yes. Smoking raises the chance of more severe disease and makes treatment less effective, so quitting is an important part of care.
When can surgery for thyroid eye disease be done?
Usually once the disease has been inactive and stable for at least about six months. Urgent cases, such as pressure on the optic nerve, may need treatment straight away.
Book a consultation with Assoc. Prof. Dr. Preamjit Saonanon in Thong Lo, Bangkok
Clinic hours: Thursday 16:00–20:00 and Saturday 09:00–20:00 (by appointment)
This article is general information and does not replace a medical examination. Results vary from person to person.
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