Eye pain has dozens of possible causes, ranging from something as simple as a dry or tired eye to serious conditions that need immediate treatment. The type of pain you feel, where exactly you feel it, and what other symptoms come along with it are the biggest clues to what’s going on. Here’s a breakdown of the most common reasons your eye might hurt and how to tell which one fits your situation.
Surface Pain vs. Deep Pain
The first distinction that matters is whether the pain feels like it’s on the surface of your eye or deep behind it. Surface pain typically presents as a scratchy, gritty, or “something is in my eye” sensation. It usually involves the clear front layer of the eye (the cornea) or the thin tissue covering the white of the eye. You’ll often notice redness, tearing, and sensitivity to light alongside it.
Deep pain feels more like a dull ache or boring pressure behind or around the eye. It can radiate into your forehead, temple, jaw, or sinuses. This type of pain is more likely tied to inflammation of deeper eye structures, sinus problems, nerve issues, or a spike in pressure inside the eye. Deep pain that comes on suddenly and severely deserves prompt medical attention.
Dry Eyes
Dry eye is one of the most common reasons for everyday eye discomfort. Your tears have three functional components: a watery layer that hydrates, a mucus layer that helps tears spread evenly, and an oily layer on top that slows evaporation. When any of these components is deficient or out of balance, the surface of your eye dries out, becomes irritated, and can feel scratchy or burning.
The pain from dry eyes often gets worse in air-conditioned rooms, on windy days, or after long stretches of reading or screen time. Ironically, dry eyes sometimes cause excessive watering, because the irritation triggers a flood of reflex tears that don’t have the right composition to actually protect the surface. Over-the-counter artificial tears are the standard first step for relief.
Digital Eye Strain
If your eyes ache after hours on a computer or phone, digital eye strain is a likely culprit. Screen text is less sharp than printed text, contrast is lower, and glare from the screen forces your eyes to work harder to focus. You also blink less frequently when staring at a screen, which dries out the eye surface and compounds the discomfort. The result is a combination of soreness, burning, blurred vision, and sometimes headache.
The simplest countermeasure is the 20-20-20 rule recommended by the American Optometric Association: every 20 minutes, look at something 20 feet away for 20 seconds. Adjusting your screen brightness, reducing overhead glare, and positioning your monitor slightly below eye level also help. For most people, the pain resolves completely once they step away from screens for a while.
Corneal Scratches and Foreign Bodies
A corneal abrasion, or scratch on the surface of the eye, causes sharp, immediate pain that worsens with blinking. Common causes include a fingernail catching the eye, a piece of dust or debris getting trapped under the eyelid, or rubbing your eyes too aggressively. Tearing, redness, light sensitivity, and the persistent feeling that something is stuck in your eye are hallmarks of this injury.
The good news is that most uncomplicated corneal abrasions heal in 24 to 48 hours. A doctor can confirm the diagnosis by applying a special dye (fluorescein) that makes the scratch glow under blue light. If vertical scratch lines appear on the upper part of the cornea, that’s a sign a foreign body may be lodged under your upper eyelid and needs to be removed. A branching, tree-like scratch pattern suggests a herpes-related eye infection, which needs a specialist right away.
Conjunctivitis (Pink Eye)
Conjunctivitis is inflammation of the thin membrane covering the white of your eye and the inside of your eyelids. The type of discharge helps identify the cause:
- Viral conjunctivitis produces watery discharge, redness, and irritation. It often starts in one eye and spreads to the other.
- Bacterial conjunctivitis causes thick yellow or green discharge along with redness and irritation. You may wake up with your eyelids crusted shut.
- Allergic conjunctivitis triggers itchiness more than pain, with watery discharge and redness in both eyes simultaneously.
If itching is the dominant symptom, allergies are the most likely cause. If pain and thick discharge are dominant, a bacterial infection is more probable and may need antibiotic eye drops.
Sinus Pressure Behind the Eyes
Not all eye pain originates in the eye itself. Your sinuses sit directly behind and around your eye sockets, and when they become inflamed or infected, the resulting pressure can produce a deep ache that feels like it’s coming from behind the eye. This pain often gets worse when you bend forward, and it’s typically accompanied by nasal congestion, facial pressure, or postnasal drip.
In rare cases, a severe sinus infection can spread into the eye socket. Warning signs of this complication include a bulging eye, limited ability to move the eye in different directions, and changes in how clearly you can see. That scenario requires urgent treatment to prevent vision damage from the increased pressure around the optic nerve.
Contact Lens Problems
Contact lenses are a frequent source of eye pain, especially when hygiene slips. The CDC identifies several specific habits that raise your risk of a corneal infection: sleeping in lenses, rinsing or storing lenses in water instead of disinfecting solution, reusing old solution by “topping off” the case instead of replacing it, not cleaning the lens case regularly, and sharing decorative lenses.
A corneal infection from contaminated lenses (microbial keratitis) causes significant pain, redness, light sensitivity, and sometimes blurred vision. It can progress quickly and threaten your sight if untreated. If you wear contacts and develop worsening eye pain, remove the lenses immediately and get evaluated the same day.
Optic Neuritis
Optic neuritis is inflammation of the nerve that carries visual information from your eye to your brain. The hallmark symptom is a dull ache behind the eye that gets noticeably worse when you move your eyes. Most people also experience some degree of vision loss, color vision changes (colors look washed out), or blurry vision in one eye.
This condition is most common in adults between 20 and 40 and is sometimes an early sign of multiple sclerosis, though it can also occur on its own. Vision often recovers over weeks to months, but the pain during eye movement is what typically drives people to seek help first.
Acute Glaucoma
Acute angle-closure glaucoma is one of the true eye emergencies. It happens when the drainage system inside the eye suddenly gets blocked, causing pressure to spike rapidly. Normal eye pressure ranges from 10 to 21 mmHg. During an acute attack, pressure can surge above 40 mmHg, more than double the upper limit of normal.
The pain is severe and comes on suddenly, often accompanied by nausea or vomiting, seeing halos around lights, a red eye, and blurred or lost vision. The affected eye may feel rock-hard to the touch compared to the other one. This is a medical emergency because permanent vision loss can happen within hours if the pressure isn’t brought back down.
Scleritis
Scleritis is inflammation of the sclera, the tough white outer wall of the eye. It produces intense, boring pain that can radiate into the forehead, jaw, or temple. Unlike the milder redness of conjunctivitis, the redness of scleritis often has a deep violet or bluish tint because deeper blood vessels are inflamed. The pain tends to worsen at night and may wake you from sleep.
Scleritis is less common than many other causes of eye pain, but it’s important because it’s frequently associated with autoimmune conditions like rheumatoid arthritis. Posterior scleritis, which affects the back of the eye, can be especially tricky to diagnose because the inflammation isn’t visible from the front.
When Eye Pain Is an Emergency
Most eye pain turns out to be something manageable, but certain combinations of symptoms signal a situation that could threaten your vision or indicate a broader medical emergency. Seek immediate care if you experience any of the following:
- Sudden, severe eye pain
- Sudden vision loss or double vision
- Flashes of light, new floaters, or halos around lights
- Eye pain with nausea or vomiting
- Eye pain with severe headache, confusion, numbness, or difficulty speaking
- Pain following an injury or chemical splash to the eye
The last set of symptoms (confusion, numbness, trouble speaking) combined with eye problems can point to a stroke, not just an eye condition. Time matters in all of these scenarios, so err on the side of getting checked quickly rather than waiting to see if it resolves.