Pressure behind one eye is almost always caused by something happening in or around the eye socket, sinuses, or nerves, not in the eyeball itself. The sensation can come from inflamed sinuses, a migraine, eye strain, or less commonly from conditions that need prompt medical attention. Because so many structures sit packed together behind the eye, the same “pressure” feeling can point to very different causes.
Sinus Inflammation
The most common explanation for pressure behind one eye is sinusitis. Your ethmoid sinuses sit between and just behind your eyes, while your maxillary sinuses sit beneath them. When one side gets congested or infected, the swollen tissue pushes against the thin bone separating the sinus from the eye socket, creating that deep pressure feeling. It’s often worse when you bend forward, and you’ll typically notice nasal congestion, post-nasal drip, or facial tenderness on the same side.
Most sinus infections resolve on their own or with a course of antibiotics. In rare cases, infection in the ethmoid or maxillary sinuses can extend into the orbit itself. If you notice the eye starting to bulge forward, limited eye movement, or changes in vision alongside sinus symptoms, that’s a sign the infection has spread beyond the sinus cavity and needs urgent treatment.
Migraine and Cluster Headache
Migraines frequently produce pain directly behind one eye. In ocular migraines specifically, the pain centers behind the affected eye and may come with visual disturbances like flickering lights, blind spots, or temporary blurring in that eye. The visual symptoms typically last 5 to 60 minutes, while the headache itself can persist for 4 to 72 hours without treatment.
Cluster headaches are another strong possibility, especially if the pressure comes on suddenly, is severe, and happens at the same time of day. They tend to affect one side consistently, often bringing tearing, redness, or a drooping eyelid on that same side. Episodes can last 15 minutes to 3 hours and recur daily for weeks.
If you get these episodes repeatedly and notice a pattern (time of day, menstrual cycle, certain foods, alcohol), tracking those details helps narrow down whether migraines or clusters are the cause.
Eye Strain From Screens
Long hours on a computer or phone can produce a pressure or aching sensation that feels like it’s sitting behind one or both eyes. You might notice it more on one side if you have an uncorrected vision difference between your eyes, or if your screen is positioned off-center so one eye works harder than the other.
A few practical fixes that reliably reduce this type of pressure:
- Take regular breaks. Look away from your screen periodically and focus on something distant to relax the muscles inside your eye.
- Blink deliberately. People blink less while staring at screens, which dries the eyes and adds to discomfort.
- Adjust lighting. Position light sources behind you rather than in front, and keep the room softly lit when looking at screens. Glare forces your eyes to strain harder.
- Enlarge text. If you’re squinting, your eye muscles are overworking. Increase font size and bring documents closer rather than leaning in.
- Check your prescription. Glasses or contacts that are slightly outdated, or not optimized for your working distance, are a common culprit. Computer-specific lenses exist for this reason.
If the pressure disappears on weekends or days off, eye strain is very likely your answer.
Optic Neuritis
Optic neuritis is inflammation of the optic nerve, which runs from the back of your eye to your brain. It produces a dull ache behind the eye that gets noticeably worse when you move your eyes side to side or up and down. Some people also see flashing or flickering lights with eye movements.
Vision typically dims or becomes blurry in the affected eye over hours to days, and colors may look washed out. Optic neuritis is sometimes an early sign of multiple sclerosis, though it can also occur on its own. It usually affects one eye at a time, so if you’re noticing pressure behind specifically your right eye along with pain on eye movement and any visual changes, this is worth getting evaluated.
Thyroid Eye Disease
An overactive thyroid, particularly Graves’ disease, can cause the immune system to attack tissues behind the eye. The result is swelling of the fat and muscles in the eye socket, which pushes the eye forward and creates a deep pressure sensation. This happens because the inflamed tissue absorbs water and expands, leaving less room in the bony socket.
Early signs include gritty or dry eyes, light sensitivity, and excessive tearing, along with the pressure feeling. As it progresses, you might notice one eye starting to protrude, double vision, or blurred vision. Thyroid eye disease is the most common cause of one eye visibly bulging forward. If you already have a thyroid condition and start feeling pressure behind one eye, bring it up with your doctor promptly, because early treatment can prevent permanent changes to eye position and vision.
Dental Problems and Jaw Disorders
This one surprises people: tooth infections and jaw problems can produce pain that feels like it’s behind your eye. The nerves serving your upper teeth, jaw joint, and eye socket all travel close together, so pain signals can get misrouted. This is called referred pain. If you also notice jaw clicking, pain when biting down, headaches along the temple, or a toothache, the eye pressure might actually be a dental or TMJ issue. A visit to the dentist can rule this in or out quickly.
Acute Glaucoma
Acute angle-closure glaucoma is rare but serious. It happens when fluid drainage inside the eye suddenly gets blocked, causing pressure inside the eyeball to spike from a normal range of 10 to 21 mmHg up to 40 to 80 mmHg within hours. The pain is typically severe, not a vague pressure, and comes with nausea or vomiting, halos around lights, a red eye, and blurred or lost vision. The affected pupil may look larger than the other one and won’t react normally to light.
This is a medical emergency that can cause permanent vision loss if not treated within hours.
How Doctors Figure Out the Cause
Because so many conditions share this symptom, diagnosis usually involves a process of elimination. An eye exam can measure the pressure inside your eye (tonometry), check the optic nerve for damage or swelling through a dilated exam, test your peripheral vision for blind spots, and inspect the drainage structures inside the eye. If sinus disease is suspected, imaging of the sinuses can confirm it. Blood work for thyroid function is straightforward and can catch Graves’ disease early.
The combination of your other symptoms matters more than the pressure alone. Pressure that worsens when bending forward points toward sinuses. Pressure that worsens with eye movement suggests optic neuritis. Pressure with visual aura suggests migraine. Pressure that eases on days away from screens is likely eye strain. Paying attention to these patterns before your appointment makes diagnosis faster.
Symptoms That Need Immediate Attention
Most causes of pressure behind the eye are manageable and not dangerous. But certain combinations of symptoms signal something that can’t wait:
- Sudden vision loss or double vision
- Severe eye pain (not a dull ache, but sharp or intense)
- Eye bulging or swelling around the eye
- Halos appearing around lights that you’ve never seen before
- Nausea or vomiting alongside eye pain
- A sudden, severe headache unlike anything you’ve had before
- Blood or pus discharging from the eye
Any of these alongside pressure behind your eye warrants emergency care rather than waiting for a scheduled appointment.