Eye pain can mean anything from tired, overstrained eyes to a serious condition that needs immediate attention. The cause usually depends on where the pain is coming from (the surface of the eye, deeper behind it, or the surrounding muscles and nerves) and what other symptoms come with it. Most eye pain is temporary and tied to something straightforward like dryness, strain, or a minor irritation, but certain combinations of symptoms signal a genuine emergency.
Surface Pain vs. Deep Pain
The cornea, the clear front layer of your eye, has some of the densest nerve endings in the entire body, with roughly 300 to 600 times more pain receptors than skin. That’s why even a tiny scratch or speck of dust can produce intense, sharp pain that feels completely out of proportion to the cause. Surface-level eye pain typically feels like stinging, burning, grittiness, or the sensation that something is stuck in your eye.
Pain that feels like it’s behind the eye or deep in the socket is different. It tends to be a dull ache or pressure, sometimes throbbing, and it often points to causes that aren’t on the eye’s surface at all: sinus pressure, migraines, or inflammation deeper within the eye or orbit. Distinguishing between the two helps narrow down what’s going on.
The Most Common Everyday Causes
Dry Eye
Dry eye is the single most common finding in people with eye pain. Your tears normally form a thin, stable film over the cornea that keeps it lubricated and protected. When that film breaks down too quickly, or your eyes don’t produce enough tears, the exposed nerve endings on the cornea fire off pain signals. You might feel burning, stinging, or a gritty, sandy sensation that gets worse later in the day. Dry eye is often connected to incomplete blinking and eyelid problems, both of which become more common with age and extended screen use.
Dry eye ranges from mild and occasional to severe and constant. In mild cases, the tear film is somewhat unstable but still functional. In moderate cases, the protective tear layer breaks apart in under 10 seconds. In the most severe cases, it breaks apart almost immediately, which means the cornea is essentially unprotected and the pain can be significant.
Digital Eye Strain
If your eyes hurt after hours on a computer, phone, or tablet, you’re far from alone. A large systematic review found that roughly 69% of office workers and 76% of university students experience computer vision syndrome, a cluster of symptoms including eye pain, dryness, blurred vision, and headaches tied to prolonged screen use. You blink less when staring at a screen, which accelerates tear evaporation and leaves the cornea exposed. The muscles that focus your lens also fatigue from holding a fixed close-up position for extended periods.
The standard recommendation is the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds. It gives both your focusing muscles and your tear film a break. Adjusting screen brightness to match the surrounding light and positioning your monitor slightly below eye level (so your eyelids cover more of the eye’s surface) also helps.
Foreign Bodies and Scratches
A corneal abrasion, essentially a scratch on the eye’s surface, causes sharp pain, tearing, redness, and light sensitivity. Common culprits include dust, sand, a fingernail, or a contact lens rubbed the wrong way. These usually heal within a day or two because the corneal surface regenerates quickly. UV burns from welding, tanning beds, or intense sunlight without eye protection are a related injury. They have a characteristic 6- to 12-hour delay: you feel fine at first, then wake up hours later with acute, intense pain in red, light-sensitive eyes.
Infections and Inflammation
Pink Eye (Conjunctivitis)
Conjunctivitis is inflammation of the thin membrane lining the white of the eye and the inside of the eyelids. It usually causes redness, watery or gunky discharge, and crusting around the eyelids in the morning, but relatively little actual pain. Vision is typically unaffected. Viral conjunctivitis often comes with cold symptoms like a sore throat or cough. Bacterial conjunctivitis produces thicker, yellowish discharge. Allergic conjunctivitis tends to be bilateral (both eyes) and intensely itchy rather than painful.
Corneal Infections
Keratitis, an infection of the cornea itself, is more serious than pink eye and produces noticeably more pain. Contact lens wearers are at higher risk, especially if lenses are worn overnight or cleaned improperly. Because the cornea’s nerve density is so extreme, keratitis can cause severe pain, light sensitivity, and blurred vision. If diagnosis or treatment is delayed, it can lead to permanent scarring or even corneal perforation. Any painful red eye in a contact lens wearer warrants prompt evaluation.
Deeper Inflammation
Inflammation inside the eye (uveitis) or of the white outer wall of the eye (scleritis) produces a deeper, more boring pain that doesn’t feel like surface irritation. Scleritis in particular can cause intense aching that worsens at night and sometimes wakes you from sleep. Both conditions are sometimes linked to autoimmune diseases and need medical treatment to prevent vision damage.
Pain Behind the Eye
When the pain feels like pressure or aching deep behind the eyeball, the cause is often something outside the eye itself.
Migraines frequently cause pain in or around one eye, accompanied by light sensitivity, sound sensitivity, throbbing, and nausea. Cluster headaches produce excruciating pain around one eye along with tearing, a runny or stuffy nose on the same side, and sometimes swelling of the eyelid. Cluster headaches come in bouts lasting weeks or months and are often described as the worst pain a person has ever experienced.
Sinus infections cause a dull pressure behind the eyes, especially around the forehead and cheeks, that worsens when you bend forward. This is usually the least alarming explanation for deep eye pain, though it’s often confused with other causes.
Optic neuritis, inflammation of the nerve connecting the eye to the brain, causes a dull ache behind one eye that gets worse when you move the eye. It can precede any noticeable vision loss. About 50% of people who experience a single episode of optic neuritis eventually develop multiple sclerosis over their lifetime, so it’s a symptom that always warrants a thorough neurological workup.
Orbital inflammation, where the muscles or tissues around the eye become inflamed, typically causes severe pain that worsens specifically with eye movement. If it hurts to look left, right, up, or down, and the pain is deep rather than on the surface, this is a possibility worth investigating.
When Eye Pain Is an Emergency
Acute angle-closure glaucoma is the most time-sensitive eye emergency involving pain. It happens when the drainage system inside the eye suddenly blocks completely, causing internal pressure to spike from a normal range of around 10 to 21 mm Hg to levels above 40 or even 60 mm Hg within hours. The eye essentially becomes a pressure cooker. Symptoms include sudden severe eye pain, blurred vision, seeing halos around lights, a red eye, headache, nausea, and vomiting. Without rapid treatment, permanent vision loss can occur within hours.
The Mayo Clinic identifies several red-flag scenarios where you should seek emergency care for eye pain:
- Severe pain with headache, fever, or extreme light sensitivity
- Sudden vision changes
- Nausea or vomiting alongside eye pain
- Chemical splash or a foreign object that won’t flush out
- Halos around lights appearing suddenly
- Swelling in or around the eyes
- Inability to move the eye or keep it open
- Blood or pus coming from the eye
Less Obvious Causes Worth Knowing
Recurrent corneal erosion syndrome is a frustrating condition where the outermost layer of the cornea doesn’t adhere properly, often as a lingering effect of a previous scratch. The hallmark is waking up with sudden sharp pain, watering, and the feeling that something is in your eye, with symptoms that gradually improve as the day goes on. It can recur for months or years after the original injury.
Shingles can cause eye pain that persists long after the visible rash has healed, sometimes for years. The pain is often described as out of proportion to what the eye looks like on examination, making it easy to dismiss. Anyone who has had chickenpox carries the virus that causes shingles, and when it reactivates along the nerve supplying the eye, the resulting nerve damage can produce chronic, burning pain.
Some conditions cause intermittent eye pain where the eye looks completely normal between episodes. Intermittent angle-closure glaucoma and certain inflammatory conditions inside the eye can produce brief, recurring bouts of pain and blurred vision that resolve on their own, only to return later. If your eyes hurt periodically with no clear explanation, mentioning the episodic pattern to your eye doctor helps guide the right tests.