Pain behind the eye usually comes from one of a handful of common causes: sinus pressure, migraines, tension headaches, or eye strain. Less often, it signals something that needs prompt medical attention, like an infection or a spike in eye pressure. The location of the pain, how long it lasts, and whether it comes with vision changes all help narrow down what’s going on.
Sinus Pressure and Infection
Sinus headaches are one of the most common reasons people feel a dull ache behind their eyes. When the sinuses around your nose, cheeks, and forehead become inflamed or infected, the swelling creates pressure that radiates into the area behind your eye sockets. You’ll typically also notice congestion, a runny nose, or tenderness across your forehead and cheekbones.
Here’s the catch: about 80% of people who think they have sinus headaches actually have migraines, according to research cited by the Cleveland Clinic. The two conditions share overlapping symptoms, including facial pressure and that deep, behind-the-eye ache. If you don’t have nasal congestion or thick nasal discharge alongside the pain, a migraine is more likely the cause.
Migraines and Tension Headaches
Migraines frequently produce pain that feels like it’s centered behind one eye. The pain is often throbbing or pulsing and can last anywhere from a few hours to a few days. Light sensitivity, nausea, and visual disturbances (like seeing flashing lights or zigzag lines) are strong clues that you’re dealing with a migraine rather than sinus trouble.
Tension headaches are less intense but still produce a pressing, aching sensation that can settle behind the eyes. These feel more like a band of tightness around your head, and they’re commonly triggered by stress, poor posture, or spending long hours staring at screens. Eye strain itself can mimic or trigger tension headaches, creating a cycle of discomfort that gets worse through the workday and eases when you rest your eyes.
Cluster Headaches
Cluster headaches cause some of the most severe pain people experience behind one eye. Each attack lasts between 15 minutes and three hours, with the average episode running about 30 minutes. What makes them distinctive is the pattern: they strike repeatedly, sometimes up to eight times within 24 hours, often at the same time each day. These clusters can continue daily for weeks or months before disappearing, sometimes for a year or more, before returning.
The pain is sharp, piercing, and strictly one-sided. You may also notice a watery or red eye, a drooping eyelid, or a runny nostril on the same side as the pain. Cluster headaches are more common in men and often begin during sleep.
Optic Nerve Inflammation
If the pain behind your eye gets noticeably worse when you move your eyes side to side or up and down, optic neuritis is a possibility. This condition involves inflammation of the nerve that connects your eye to your brain. It typically affects one eye at a time and causes temporary vision loss or dimming alongside the pain. Some people also see flashing or flickering lights when they move their eyes.
Optic neuritis can occur on its own, but it’s sometimes an early sign of an autoimmune condition like multiple sclerosis. The vision loss usually improves over weeks to months, though the timeline varies.
Thyroid Eye Disease
An overactive thyroid, particularly Graves’ disease, can cause a buildup of tissue behind the eyes that pushes them forward and creates a feeling of pressure or pain deep in the socket. You might notice your eyes look more prominent than usual, or that they feel gritty, dry, or swollen. The condition affects the muscles and tissues surrounding the eyes, which can also make it harder to move your eyes comfortably.
Scleritis and Inflammation of the Eye Wall
Scleritis is inflammation of the sclera, the tough white outer coating of your eye. It produces piercing pain that worsens with eye movement and can be severe enough to wake you from sleep. The pain often spreads to other parts of your face. When inflammation affects the back of the sclera (posterior scleritis), the pain feels deeply seated behind the eye rather than on the surface. Redness of the white part of the eye is a visible sign, though posterior scleritis may not show obvious redness.
A related condition called uveitis involves inflammation of the layer just beneath the sclera. Both conditions are sometimes linked to autoimmune diseases like rheumatoid arthritis or lupus.
Orbital Cellulitis
Infections of the tissue behind the eye socket, called orbital cellulitis, are uncommon but serious. The infection often starts as a sinus infection that spreads deeper. Signs include swelling and redness of the eyelid, pain that worsens with eye movement, reduced ability to move the eye, blurry vision, fever, and the eyeball visibly pushing forward. Sinus-related symptoms like nasal discharge or bleeding are often present too.
This is different from a simpler eyelid infection (preseptal cellulitis), which causes swelling and redness but doesn’t affect your vision or eye movement. The key distinction: if you can still see clearly and move your eye freely, the infection is likely superficial. If your vision is blurry, eye movement is painful or limited, or your eye appears to be bulging, the infection may have spread behind the eye and needs emergency treatment. Left untreated, orbital cellulitis can lead to vision loss or spread to the brain.
Acute Angle-Closure Glaucoma
A sudden spike in pressure inside the eye can cause severe pain behind the eye along with a bad headache, nausea or vomiting, blurred vision, halos or colored rings around lights, and eye redness. This is called acute angle-closure glaucoma, and it’s a medical emergency. The fluid drainage system inside the eye becomes suddenly blocked, and without treatment, it can permanently damage your vision. If you experience severe eye pain with any combination of these symptoms, go to an emergency room.
When the Pain Points to Something Serious
Most behind-the-eye pain comes from benign causes that resolve on their own or respond to simple treatment. But certain combinations of symptoms need prompt attention:
- Sudden vision loss or blurriness alongside eye pain can indicate optic nerve inflammation, glaucoma, or retinal detachment.
- Pain with fever, swelling, and reduced eye movement suggests an orbital infection.
- New floaters that don’t go away within a few minutes can signal a retinal tear or detachment.
- Severe headache with eye pain, nausea, and halos around lights points to acute glaucoma.
- Pain that worsens with eye movement plus vision changes in one eye raises concern for optic neuritis.
If your pain is mild, comes and goes, and isn’t paired with vision changes, it’s reasonable to monitor it for a few days, especially if you’ve been under stress, congested, or spending excessive time on screens. Pain that persists for more than a week, keeps coming back in a pattern, or arrives with any of the warning signs above warrants an eye exam to rule out conditions that are easier to treat when caught early.