Eye pain has dozens of possible causes, ranging from something as simple as a dry or tired eye to something that needs same-day medical attention. The type of pain you’re feeling, where exactly it is, and what other symptoms come with it are the biggest clues to what’s going on. Most eye pain falls into two broad categories: surface pain (stinging, burning, gritty sensations) and deeper, aching pain behind or around the eye.
Surface Pain: Burning, Gritty, or Stinging
If your eye feels like something is stuck in it, or it burns, stings, or feels sandy, the issue is most likely on the front surface of the eye. The cornea (the clear outer layer) and the conjunctiva (the thin membrane covering the white part) are packed with nerve endings, so even a tiny irritation can produce real discomfort.
Corneal abrasion. A scratch on the cornea is one of the most common causes of sudden, sharp eye pain. It can happen from a fingernail, a contact lens, a branch, or even rubbing your eye too hard. Small abrasions typically heal in one to two days, while larger scratches can take about a week. You’ll usually notice tearing, sensitivity to light, and a feeling that something is in your eye even after you’ve flushed it.
Dry eye. Chronic dryness causes a low-grade burning or gritty sensation that tends to get worse as the day goes on, especially in air-conditioned rooms or windy environments. The pain is usually mild but persistent enough to be distracting.
Conjunctivitis (pink eye). The viral form, which is the most common, causes burning, redness, and watery eyes. Bacterial conjunctivitis produces sticky pus and tends to affect one eye. Allergic conjunctivitis causes intense itching along with redness and tearing. Each type feels slightly different, and knowing which one you’re dealing with matters because bacterial pink eye responds to antibiotic drops while viral pink eye does not.
Foreign body. A speck of dust, an eyelash, or a small metal fragment can lodge under the eyelid and cause sharp, scratching pain with every blink. Flushing the eye with clean water often dislodges it. If the object is embedded in the eye, don’t try to remove it yourself.
Deep or Aching Pain Behind the Eye
Pain that feels like pressure or a dull ache behind or around the eyeball usually involves structures deeper than the surface. This kind of pain can come from inside the eye itself or be referred from nearby areas like the sinuses or the muscles around the orbit.
Sinusitis. Inflamed sinuses, particularly the ethmoid sinuses between the eyes and the frontal sinuses above them, can produce pressure and aching that feels like it’s coming from the eye. The pain typically gets worse when you bend forward or lie down, and you’ll usually have nasal congestion, facial pressure, or a headache alongside it. Treating the sinus inflammation generally resolves the eye pain.
Migraine and cluster headache. Migraines frequently cause throbbing pain around or behind one eye, often with light sensitivity, nausea, or visual disturbances. Cluster headaches produce severe, stabbing pain around one eye, sometimes with a droopy eyelid or tearing on the same side. In both cases, the eye itself is healthy. The pain originates in the brain and nervous system.
Scleritis and uveitis. These are inflammatory conditions affecting the white outer wall of the eye (scleritis) or the middle layer inside the eye (uveitis). Both cause deep, boring pain that can wake you up at night, along with redness and sometimes blurred vision. They often have an underlying autoimmune connection and need prompt treatment to protect your vision.
Screen Time and Eye Strain
If your eye pain shows up after hours of computer work, reading, or phone use, digital eye strain is a likely culprit. The symptoms split into two patterns. One is a dry, burning, irritated feeling caused by reduced blinking during screen use, since people blink about 60% less when staring at screens. The other is a strain or ache behind the eyes, often with a headache, caused by the constant effort your focusing muscles make to keep a screen sharp at close range.
Blurred vision at the end of a long work session, difficulty refocusing when you look away from the screen, and sensitivity to bright lights are all part of the same picture. Taking regular breaks (looking at something 20 feet away for 20 seconds every 20 minutes), adjusting screen brightness, and using lubricating drops for dryness are the most effective remedies. Digital eye strain doesn’t cause lasting damage, but it can make your days miserable if you don’t manage it.
Contact Lens Problems
Contact lenses are one of the most common causes of eye pain in people under 40. Wearing lenses too long, sleeping in them, or cleaning them poorly allows bacteria and other organisms to gain access to the cornea. This can lead to a corneal ulcer, which is an open sore on the cornea that causes intense pain, redness, light sensitivity, and sometimes a visible white spot on the eye. Corneal ulcers are serious and can scar the cornea permanently if not treated quickly.
Lenses can also trigger a condition where bumps form under the upper eyelid (giant papillary conjunctivitis), making the eye itchy, mucusy, and uncomfortable with lenses in. If your lenses suddenly feel uncomfortable after months of being fine, something has changed, and continuing to wear them through the pain risks making it worse.
Acute Glaucoma
Acute angle-closure glaucoma is rarer than the causes above, but it’s the one you don’t want to miss. It happens when the drainage channel inside the eye suddenly closes off, causing pressure inside the eye to spike. The symptoms are distinctive: severe eye pain, a rock-hard feeling in the eye, redness, blurred vision, seeing halos or rainbow-colored rings around lights, headache, and nausea or vomiting. It tends to come on fast, often over minutes to hours.
This is a genuine emergency. Without treatment within hours, the high pressure can permanently damage the optic nerve and cause irreversible vision loss. If you have sudden, severe eye pain combined with nausea, halos around lights, or vision changes, go to an emergency room.
How to Tell What’s Serious
Most eye pain resolves on its own or with simple measures like lubricating drops, removing a contact lens, or resting your eyes. But certain combinations of symptoms point to something that needs prompt attention:
- Pain with vision changes. Any eye pain paired with blurry vision, double vision, or sudden vision loss needs same-day evaluation.
- Pain with nausea or vomiting. This combination suggests acute glaucoma or another serious pressure problem.
- Pain after an injury. Even if the pain seems mild, blunt trauma to the eye can cause internal bleeding or retinal damage that isn’t immediately obvious.
- Pain that worsens over 24 to 48 hours. A corneal abrasion or mild irritation should improve, not get worse. Worsening pain suggests an infection or ulcer may be developing.
- Flashes of light, new floaters, or a shadow in your vision. These are signs of possible retinal detachment, which is painless but requires immediate treatment to prevent permanent vision loss.
For most non-emergency eye issues, an optometrist or ophthalmologist is a better first call than an emergency room. Eye doctors have specialized instruments like slit lamps and tonometers that ERs may not have, and they’re better equipped to diagnose conditions like corneal abrasions, dry eye, or uveitis. Emergency rooms are the right choice when the situation involves chemical exposure, a deeply embedded foreign object, head trauma, or the sudden severe symptoms described above.
If you’ve had a chemical splash in your eye, rinse it with clean water for at least 15 minutes before heading anywhere. Time matters more than the destination in that situation.