Eye pain has dozens of possible causes, ranging from something as minor as a dry patch on the surface to something as serious as a sudden spike in pressure inside the eye. The type of pain you feel, where exactly it sits, and whether your vision has changed are the biggest clues to what’s going on. Most eyeball pain falls into two broad categories: surface irritation and deeper, internal pain.
Surface Pain vs. Deep Pain
The single most useful thing you can do before anything else is figure out whether your pain feels like it’s on the surface or deeper inside the eye. Surface pain tends to feel scratchy, gritty, or like something is stuck in your eye. It usually gets worse when you blink. Deep pain feels more like an ache or throb coming from behind or within the eyeball itself, and it can radiate into the forehead or cheek.
Surface pain most often points to problems with the eyelid, the clear outer layer of the eye (the conjunctiva), or the cornea. Deep, throbbing pain is more concerning. It can signal conditions like glaucoma, inflammation of the inner or outer wall of the eye, or an infection that has spread into the eye socket. Deep pain paired with swelling, a bulging eye, or trouble moving the eye in any direction raises the urgency considerably.
Dry Eyes
Dry eye is one of the most common reasons for persistent, low-grade eye pain. It typically causes stinging, burning, or a scratchy feeling in both eyes at once. You might also notice sensitivity to light, blurred vision that clears when you blink, eye fatigue after reading or screen time, or watery eyes (which is actually the eye’s reflex response to the irritation). Contact lens wearers often notice it as sudden lens intolerance.
Dry eye tends to be worse in air-conditioned or heated rooms, on windy days, and after long stretches of focused screen work where your blink rate drops. Left untreated over time, severe dryness can damage the corneal surface and even cause ulcers, so it’s worth addressing even when it feels mild.
Corneal Abrasion or Foreign Body
If your pain came on suddenly, feels sharp, and gets noticeably worse when you blink, the most likely explanation is a scratch on the cornea or a tiny particle trapped under your eyelid. A corneal abrasion typically causes intense light sensitivity along with tearing and redness. The pain can feel out of proportion to what caused it because the cornea is packed with nerve endings.
Most small abrasions heal on their own within 24 to 48 hours. Rubbing the eye is the worst thing you can do, since it can deepen the scratch or grind a foreign particle further into the surface. Flushing the eye gently with clean water or saline can help dislodge debris. If the pain doesn’t improve within a day, or if you notice any white spot on the eye or worsening vision, that scratch may have become a corneal ulcer, which needs prompt treatment.
Sinus Pressure and Migraines
Not all eye pain starts in the eye. A dull ache behind your eyes, especially in your cheekbones, forehead, or the bridge of your nose, often comes from swollen sinuses. Sinus-related eye pain tends to affect both sides of your face and gets worse when you bend over or move your head quickly. You’ll usually have other signs of congestion too: stuffiness, postnasal drip, or facial tenderness when you press on the area.
Here’s a fact worth knowing: studies suggest that roughly 80% of people who believe they have sinus headaches actually have migraines. The two overlap quite a bit. Migraines can cause pain around and behind one eye, along with nausea, light sensitivity, and sometimes visual disturbances like flashing lights or zigzag lines. If your “sinus headache” keeps coming back without typical cold symptoms, a migraine may be the real culprit.
Acute Angle-Closure Glaucoma
This is the eye pain emergency most people don’t know about. Acute angle-closure glaucoma happens when the drainage channel inside the eye gets suddenly blocked, causing pressure to spike rapidly. The symptoms come on fast: severe eye pain, a red eye, blurred vision, seeing rainbow-colored halos around lights, headache, and nausea or vomiting. The affected pupil is often mid-dilated and doesn’t respond normally to light, and the cornea can look hazy or cloudy.
This combination of symptoms needs emergency care within hours, not days. Without treatment, the sustained high pressure can permanently damage the optic nerve and cause irreversible vision loss. If you’re experiencing sudden, severe eye pain with any vision changes and nausea, treat it the same way you’d treat chest pain: get to an emergency room.
Inflammation Inside or Around the Eye
Two inflammatory conditions cause significant eye pain and are worth knowing about because they’re not always obvious at first glance.
Uveitis is inflammation of the middle layer of the eye wall. It causes a deep ache, redness, light sensitivity, and blurred vision. It can come on gradually over hours to days and sometimes follows a viral illness or is linked to autoimmune conditions.
Scleritis is inflammation of the white outer wall of the eye. The pain is often severe, boring, and can wake you up at night. The eye develops a characteristic violet or bluish-red hue that’s different from the bright redness of simple irritation. The eyeball itself is tender to touch, and pain frequently worsens with eye movement. About half of scleritis cases are associated with an underlying autoimmune condition like rheumatoid arthritis. The most severe form, necrotizing scleritis, causes extreme pain and can threaten the structural integrity of the eye if not treated aggressively.
What Happens at an Eye Exam
When you see an eye care provider for pain, two tests give the most information quickly. A slit-lamp exam uses a specialized microscope with a bright, narrow beam of light to examine the surface and interior structures of the eye in fine detail. It can reveal corneal scratches, signs of infection, inflammation inside the eye, and abnormalities in the drainage angle. The second key test is tonometry, which measures the pressure inside your eye. It’s the primary screening tool for glaucoma and takes only a few seconds. Together, these two tests can rule out or confirm most of the serious causes of eye pain in a single visit.
What to Avoid at Home
Over-the-counter artificial tears are generally safe for soothing dry, irritated eyes. However, “redness relief” drops, the kind that promise to make your eyes white, work by constricting blood vessels. Using them frequently can cause rebound redness, where the eye becomes even more red and irritated once the drops wear off, creating a cycle that makes things worse.
Avoid pressing on or rubbing a painful eye, especially if there’s any chance of a scratch or foreign body. Don’t wear contact lenses until the pain has fully resolved. And skip the warm compress if the eye is very red and swollen with vision changes, since heat can worsen certain infections.
Pain Patterns That Need Urgent Attention
Certain combinations of symptoms signal that something potentially sight-threatening is happening. Get evaluated the same day if you notice any of these alongside your eye pain:
- Sudden vision loss or blurring in the painful eye
- Halos around lights with nausea, especially in dim lighting
- A bulging eye with swelling of the eyelid and limited eye movement
- Pain after trauma or any sensation of fluid leaking from the eye
- New flashes of light or a curtain-like shadow moving across your vision
- A white or gray spot on the colored part of the eye or cornea
Eye pain that is mild, came on gradually, affects both eyes equally, and isn’t accompanied by vision changes is far less likely to be an emergency. But pain in one eye that is severe, worsening, or paired with any visual disturbance deserves a prompt professional evaluation, even if you’re not sure it’s “bad enough” to warrant one.