Pressure behind the eyes is most commonly caused by sinus congestion or migraine, though several other conditions can produce the same sensation. The feeling can range from a dull ache to intense tightness, and the cause isn’t always what you’d expect. About 90% of people who believe their eye pressure comes from a sinus problem are actually experiencing migraine attacks, according to the American Migraine Foundation.
Sinus Congestion and Infection
Your skull contains air-filled cavities called sinuses, and one pair sits directly behind your eyes. These sphenoid sinuses are the most common sinus-related source of retro-orbital pressure. When the tissue lining your sinuses becomes inflamed from a cold, allergies, or a bacterial infection, the swollen tissue blocks the narrow drainage passages. Mucus builds up, and the resulting pressure radiates into the areas surrounding the affected sinus.
Sinus pressure behind the eyes typically comes with other recognizable symptoms: a stuffy or runny nose, reduced sense of smell, facial tenderness, and sometimes a low-grade fever if infection is present. The pressure often worsens when you bend forward. If these accompanying symptoms are absent, your eye pressure is probably not sinus-related, even if it feels like it is.
Migraine Is the Most Common Culprit
Migraine is far more likely to cause pressure or pain behind the eyes than most people realize. In a study of nearly 3,000 people who reported recurring “sinus headaches,” researchers found that 88% actually had migraine. The confusion happens because migraine can cause nasal congestion and watery eyes, mimicking a sinus problem.
Migraine pain is typically moderate to severe and throbbing, often concentrated around the temple, eye, or back of the head on one side. It’s frequently accompanied by nausea and sensitivity to light and sound. Some people experience visual disturbances beforehand, like shimmering lines or blind spots. If your eye pressure comes and goes in episodes, hits one side more than the other, and makes you want to lie down in a dark room, migraine is a strong possibility.
Tension-type headaches can also create a sensation of pressure around or behind the eyes, though the feeling is usually milder and more diffuse. This type produces a steady, band-like tightness across the forehead or around the entire head rather than localized throbbing. It rarely comes with nausea or light sensitivity.
Thyroid Eye Disease
An overactive thyroid, particularly Graves’ disease, can cause a persistent feeling of pressure behind the eyes that doesn’t resolve the way a headache or sinus infection would. In thyroid eye disease, the immune system produces antibodies that attack not only the thyroid gland but also tissues behind the eyes. These antibodies bind to receptors in the orbital fat and muscles, causing inflammation and swelling in a space that has very little room to expand.
The result is a sensation of tightness or bulging, and in more advanced cases, the eyes may visibly protrude. Other signs include dry or gritty eyes, redness, double vision, and difficulty closing the eyelids completely. If your eye pressure is constant, worsening over weeks or months, and accompanied by any of these symptoms, thyroid function is worth investigating.
Optic Neuritis
Optic neuritis, inflammation of the nerve connecting the eye to the brain, produces a distinctive type of pain behind the eye that worsens specifically when you move your eyes. It usually affects only one eye. Unlike migraine or sinus pressure, optic neuritis comes with measurable vision changes: colors may look washed out, central or peripheral vision may blur or disappear, and some people see flashing or flickering lights with eye movement.
Vision loss from optic neuritis typically develops over hours to days and improves over several weeks to months. This condition is sometimes an early sign of multiple sclerosis, so it warrants prompt evaluation even though the vision changes are often temporary.
Glaucoma
The most common forms of glaucoma build up pressure inside the eye gradually and silently, often without any noticeable pressure sensation at all. Chronic glaucoma may eventually cause mild eye discomfort or a brow ache, but many people have no symptoms until vision damage has already occurred.
Acute angle-closure glaucoma is a different story. It comes on suddenly and causes severe eye pain, blurred vision, halos around lights, nausea, vomiting, and a visibly red eye. This is a medical emergency requiring immediate treatment to prevent permanent vision loss. If your eye pressure appeared abruptly alongside any combination of these symptoms, go to an emergency room or call an ophthalmologist right away.
How to Tell the Causes Apart
The accompanying symptoms are the most useful clues:
- Nasal congestion, facial tenderness, fever: likely sinus-related, though consider migraine if the congestion is mild
- One-sided throbbing with nausea or light sensitivity: likely migraine
- Band-like tightness across the forehead: likely tension headache
- Pain that worsens with eye movement and vision changes in one eye: likely optic neuritis
- Persistent pressure with dry, bulging, or red eyes: possible thyroid eye disease
- Sudden severe pain with halos, nausea, and red eye: possible acute glaucoma, requiring emergency care
What Happens at the Doctor’s Office
If your eye pressure is recurring, worsening, or accompanied by vision changes, an eye exam is the logical next step. A standard evaluation includes checking your visual acuity (how sharply you see at various distances), examining how your pupils respond to light, and testing your eye movement in different directions. Your doctor may measure the pressure inside your eye using a quick, painless test where a small instrument gently touches or blows air at the surface of your eye.
If the cause isn’t clear from an office exam, imaging may be ordered. A CT scan of the sinuses can confirm or rule out sinusitis. An MRI can reveal optic nerve inflammation or other abnormalities behind the eye. Blood tests for thyroid function are straightforward and can identify Graves’ disease. In most cases, a combination of your symptom history and one or two of these tests is enough to pinpoint the cause and guide treatment.