Eye pain has dozens of possible causes, ranging from something as minor as a dry eye or a tiny scratch on the surface to something more serious like a sudden spike in pressure inside the eye. The type of pain you feel, where exactly it’s located, and what makes it worse are the best clues to figuring out what’s going on.
What Your Pain Feels Like Matters
Not all eye pain is the same, and the way you’d describe yours can point toward very different causes. A gritty, sandy feeling usually means something is irritating the surface of the eye. A dull throb or pressure sensation often originates deeper, behind the eye or within the eye socket. Stabbing or shooting pain tends to involve nerves, while a burning feeling is more commonly tied to dryness or chemical irritation.
It also helps to think about where the pain is. The cornea (the clear front surface), the white of the eye, the eyelid, and the bony socket surrounding your eye can all generate pain independently. Surface pain and deep orbital pain have different causes, different urgency levels, and different treatments.
Surface Causes: Scratches, Dryness, and Irritation
The most common reason for sudden eye pain is a corneal abrasion, a small scratch on the clear front surface of the eye. It often feels like something is stuck in your eye even after you’ve flushed it out. Contact lenses, a fingernail, dust, or even rubbing your eyes too hard can all cause one. Minor abrasions heal fast. The surface cells of the cornea reproduce quickly, and most people feel significantly better within 24 to 48 hours. Larger scratches take longer but still tend to heal on their own.
Dry eye is another extremely common culprit. When your eyes don’t produce enough tears or the tears evaporate too quickly, the surface dries out and becomes irritated. This creates a burning or stinging sensation that can worsen throughout the day, especially if you spend long hours looking at a screen. Blinking less (which happens naturally during screen use) makes it worse.
Inflammation of the tissue layers over the white of the eye can also cause pain. Episcleritis affects the more superficial layer and tends to cause mild redness and discomfort. Scleritis involves deeper tissue and is more serious, producing more intense pain and a deeper red or violet discoloration. Scleritis sometimes signals an underlying autoimmune condition and needs prompt evaluation.
Screen Time and Eye Strain
If your eye pain is an aching, tired feeling that builds over the course of a workday and eases when you step away from your computer, digital eye strain is the likely explanation. Your eye muscles work harder to maintain focus at close range for extended periods, and the reduced blink rate during screen use dries out the surface at the same time.
The 20-20-20 rule is the most commonly recommended fix: every 20 minutes, look at something 20 feet away for 20 seconds. A study testing this approach with personalized software reminders found that it reduced both eye strain symptoms and dry eye symptoms within two weeks. The catch is that the improvement didn’t persist once people stopped taking the breaks, so consistency matters. Adjusting screen brightness, reducing glare, and keeping your monitor at arm’s length also help.
Deep Pain Behind the Eye
Pain that feels like pressure pushing outward from behind your eyeball, or a deep ache within the socket, points to causes that aren’t on the eye’s surface at all.
Sinus infections are one of the more frequent explanations. The sinuses sit directly behind and around the eye sockets, and when they’re swollen and full of fluid, the pressure radiates into the area around the eye. This kind of pain typically worsens when you bend forward and comes with congestion.
Cluster headaches produce some of the most intense pain a person can experience, and it centers on one eye. A single attack lasts 15 minutes to 3 hours, though most last 30 to 45 minutes. During a cluster period, these headaches strike daily, often several times a day, and frequently at the same time each day. Most attacks happen at night, typically 1 to 2 hours after falling asleep. Cluster periods can last anywhere from a week to a year, followed by months of remission. The affected eye often becomes red, teary, or droopy during an attack.
Orbital cellulitis, an infection of the tissue within the eye socket, causes deep pain along with swelling, difficulty moving the eye, and sometimes blurry or double vision. This is a serious infection that needs treatment quickly to prevent complications.
Pain That Gets Worse When You Move Your Eyes
If your eye aches more when you look side to side or up and down, optic neuritis is one possibility worth knowing about. This happens when the immune system mistakenly attacks the protective coating around the optic nerve, the cable that carries visual signals from the eye to the brain. The inflammation disrupts those signals and can cause blurred vision, dimmed color perception, or partial vision loss alongside the pain.
Optic neuritis is sometimes the first sign of multiple sclerosis, though it can also be triggered by infections like Lyme disease, measles, or herpes, or by other autoimmune conditions like lupus. Not everyone who has optic neuritis develops MS, but the association is strong enough that doctors typically investigate further.
Light Sensitivity and Eye Pain
Pain that flares up in bright light, called photophobia, is a feature of several eye conditions, particularly uveitis (inflammation inside the eye). What’s interesting is that the pain from light doesn’t come through the visual system the way you might expect. Research from the American Academy of Ophthalmology points to the trigeminal nerve, the main sensory nerve for the face, orbit, and head, as the primary driver. Experiments have shown that cutting the optic nerve doesn’t stop the pain response to bright light, but cutting the trigeminal nerve does. This is why light sensitivity accompanies so many conditions beyond just eye problems, including migraines and concussions.
If you have photophobia along with a red eye, deep aching pain, and blurred vision, uveitis is a strong possibility. An irregular-looking pupil is another hallmark. This combination needs same-day evaluation.
When Eye Pain Is an Emergency
A few types of eye pain signal conditions that can permanently damage your vision if not treated within hours.
Acute angle-closure glaucoma happens when the drainage system inside the eye suddenly blocks, causing pressure to spike rapidly. Normal eye pressure sits between 10 and 21 mmHg. During an acute attack, it can jump above 40 mmHg and sometimes above 50. The pain is severe and comes on suddenly, often with nausea, vomiting, halos around lights, and a red eye. The pupil may look fixed or mid-dilated. This requires emergency treatment to prevent permanent optic nerve damage.
A penetrating eye injury, where something has punctured the eye, is the other clear emergency. If you see tissue protruding, have severe pain after a high-speed impact, or notice sudden dramatic vision loss after trauma, go to an emergency department immediately. Do not press on the eye or try to remove anything embedded in it.
Patterns That Help Identify the Cause
When trying to figure out what’s behind your eye pain, pay attention to a few key details. How fast did it come on? Sudden onset suggests something acute like an abrasion, glaucoma attack, or infection. Gradual buildup over hours or days is more typical of strain, dryness, or inflammatory conditions.
Is the pain in one eye or both? One-sided pain is more concerning and points toward conditions like cluster headaches, glaucoma, or optic neuritis. Pain in both eyes is more often related to strain, dryness, or sinus pressure.
What makes it worse? Pain that increases with eye movement suggests optic neuritis or orbital inflammation. Pain worsened by light points to uveitis, corneal abrasion, or migraine. Pain that builds during screen use and resolves with rest is almost certainly eye strain.
Any vision changes alongside the pain raise the urgency significantly. Blurred vision, double vision, partial vision loss, new floaters, or flashing lights all warrant prompt professional evaluation, especially when paired with a red or swollen eye.