Pain behind the eye, often described as a deep ache or pressure at the back of the eye socket, usually comes from one of a handful of common causes. Most often it’s related to eye strain, sinus pressure, or a headache disorder. Less commonly, it signals something more serious involving the eye itself. The location of this pain feels alarming because the area is so close to the brain, but most causes are treatable once identified.
Digital Eye Strain
The most common reason for aching behind the eyes is prolonged screen use. When you focus on a screen for hours, the small muscles that control your lens and eye movement fatigue, much like any overworked muscle. This creates a dull ache that can feel like it’s coming from deep inside or behind the eyeball. You might also notice blurred vision when you look away from the screen, difficulty refocusing between near and far distances, and a general sense of tired, heavy eyes.
Headache, stiff neck, and overall fatigue often tag along with eye strain. These symptoms typically resolve after you rest your eyes for a while, and they tend to be worse at the end of the day. If the pain consistently appears after long stretches of close-up work and disappears with rest, eye strain is the most likely explanation.
Sinus Inflammation
Your sinuses sit remarkably close to your eye sockets. The ethmoid sinuses, positioned between your eyes, and the sphenoid sinuses, located behind them, are separated from the orbit by a paper-thin layer of bone called the lamina papyracea. When these sinuses become inflamed from a cold, allergies, or infection, the swelling and pressure can radiate directly into the area behind your eyes.
Sinus-related eye pain usually comes with nasal congestion, facial pressure, and sometimes a low-grade fever. The pain tends to worsen when you bend forward or lie down. It often affects both sides, though one side can be worse than the other. If you’ve had cold symptoms for more than a week and the pain behind your eyes hasn’t let up, a sinus infection is a strong possibility.
Migraine and Cluster Headaches
Migraines frequently center behind one eye, producing a throbbing or pulsing pain that can last hours to days. Light sensitivity, nausea, and visual disturbances (like shimmering lines or blind spots) help distinguish migraine from other causes. The pain tends to build gradually and worsens with physical activity.
Cluster headaches are a different beast entirely. They produce excruciating, boring pain behind one eye that peaks in 10 to 15 minutes and typically lasts 30 to 45 minutes, though attacks can stretch up to three hours. During a cluster period, attacks strike two to three times a day, often at the same time. The pain is so intense that people feel restless and agitated, unable to sit still. On the affected side, you’ll typically notice a watering eye, a drooping eyelid, nasal congestion or a runny nose, and facial sweating. These autonomic symptoms are a hallmark of cluster headaches and help set them apart from migraines.
Optic Neuritis
Optic neuritis is inflammation of the optic nerve, the cable that carries visual signals from your eye to your brain. Over 90% of people with optic neuritis experience eye pain, and it has a very distinctive feature: the pain gets noticeably worse when you move your eyes. This happens because eye movement tugs on the inflamed nerve.
Along with the pain, vision in the affected eye typically becomes blurry or dim over days, and colors may look washed out. It usually affects one eye at a time. Optic neuritis can occur on its own but is sometimes an early sign of multiple sclerosis, so it warrants prompt evaluation by an eye specialist.
Scleritis
The sclera is the tough white outer wall of your eyeball. When it becomes inflamed, a condition called scleritis, the result is a deep, severe ache that can radiate to the forehead, cheek, or jaw. This pain is persistent enough to interfere with sleep, which distinguishes it from the milder, more superficial condition called episcleritis (which causes redness but typically no real pain or light sensitivity). Scleritis causes light sensitivity and a deep red or violet discoloration of the eye. It’s often linked to autoimmune conditions like rheumatoid arthritis and needs treatment to prevent damage to the eye wall.
Acute Angle-Closure Glaucoma
This is one of the true eye emergencies. It happens when the drainage system inside the eye suddenly blocks, causing fluid pressure to spike. Normal eye pressure sits between 10 and 21 mm Hg. During an acute attack, pressure can rocket to 60 or 80 mm Hg, producing sudden, severe pain in and behind the eye along with a headache on the same side.
The warning signs are hard to miss: the eye becomes very red, vision goes blurry, you see rainbow-colored halos around lights, and you may feel nauseated or vomit. The pupil on the affected side is often mid-sized or dilated and doesn’t react normally to light. This combination of symptoms requires emergency treatment within hours to prevent permanent vision loss.
Orbital Infections
Infections that spread into the eye socket, usually from a nearby sinus infection, cause deep pain behind the eye along with swelling, redness of the eyelids, and difficulty moving the eye. The defining features of orbital cellulitis are pain with eye movement, restricted eye movement, and the eyeball pushing forward (proptosis). The orbit’s thin bony walls and valve-less blood vessels allow infection to travel quickly from the sinuses into the tissue surrounding the eye. Left untreated, the infection can spread toward the brain, so imaging with a CT scan is standard when orbital cellulitis is suspected.
Thyroid Eye Disease
In people with an overactive thyroid (Graves’ disease), the immune system can trigger swelling of the muscles and fat tissue inside the eye socket. Because the socket is a confined bony space, this expansion creates a chronic aching pressure behind the eyes. Both eyes are usually affected, and over time the eyes may appear to bulge. Double vision, dry eyes, and difficulty closing the lids completely are other common signs.
Red Flags That Need Immediate Attention
Most behind-the-eye pain resolves with rest, treating a sinus issue, or managing a headache. But certain combinations of symptoms point to conditions that can permanently damage your vision if not treated quickly:
- Sudden vision loss or a noticeable drop in clarity in the affected eye, especially alongside pain
- A fixed, dilated pupil that doesn’t shrink in bright light
- Halos around lights with nausea and vomiting, suggesting acute glaucoma
- Inability to move the eye normally or new double vision
- The eye pushing forward or significant eyelid swelling beyond the lid margin
- Severe pain that wakes you from sleep or doesn’t respond to over-the-counter pain relievers
Any of these warrants same-day evaluation by an ophthalmologist or a visit to the emergency department. For pain that’s mild, comes and goes with screen use or sinus congestion, and isn’t paired with vision changes, a routine appointment with an eye doctor is a reasonable next step if it persists beyond a week or two.