Eye pain has dozens of possible causes, ranging from something as minor as a dry eye or a tiny scratch to something that needs same-day treatment like a sudden spike in eye pressure. Where exactly it hurts, how the pain feels, and whether your vision has changed are the biggest clues to what’s going on.
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 deeper behind it. Surface pain typically involves the cornea (the clear front layer), the conjunctiva (the thin protective membrane over the white of your eye), or the eyelid. It tends to feel sharp, gritty, or stinging. Deep or orbital pain feels like a dull ache or pressure behind or around the eye, and it can signal problems inside the eye, in the eye socket, or even in structures that have nothing to do with your eye at all.
This difference isn’t just academic. Surface problems are far more common and usually resolve on their own or with simple treatment. Deep, aching pain that comes with vision changes is more likely to need prompt evaluation.
Dry Eyes
Dry eye is one of the most common reasons eyes hurt, and it often catches people off guard because the pain can be surprisingly intense for something that sounds so benign. It typically causes a stinging, burning, or scratchy sensation in both eyes, along with the feeling that something is stuck in them. Paradoxically, dry eyes can also make your eyes water more than usual, because the irritation triggers a reflex response.
Screen time, air conditioning, contact lenses, and aging all contribute. If your eye pain is a low-grade burn that’s worse at the end of the day or after long stretches of reading, dry eye is a likely culprit.
Corneal Scratches and Injuries
A corneal abrasion, or scratch on the surface of the eye, causes sharp pain, tearing, redness, light sensitivity, and the persistent sensation that something is in your eye. Common causes include a fingernail, a contact lens, dust, or sand. Even a tiny scratch on the cornea can produce surprisingly strong pain because the cornea is packed with nerve endings.
The good news is that minor corneal abrasions heal fast. The surface cells of the cornea reproduce quickly, and most people feel significantly better within 24 to 48 hours. Larger or deeper scratches take longer. Until a scratch heals, avoid rubbing the eye, and don’t wear contact lenses.
More serious corneal problems, like an open sore (corneal ulcer) or deeper inflammation called keratitis, produce similar symptoms but don’t resolve on their own. If pain, redness, and light sensitivity persist beyond a couple of days, or if you notice a white spot on the cornea, that warrants a closer look.
Styes and Chalazia
If the pain is concentrated on your eyelid rather than the eye itself, you’re likely dealing with a stye or a chalazion. A stye is a small, painful lump at the base of an eyelash or just under the eyelid edge, caused by a bacterial infection. It often swells quickly, sometimes puffing up the entire eyelid.
A chalazion looks similar but is usually painless or only mildly tender. It forms farther back on the eyelid from a clogged oil gland rather than an infection, and it rarely makes the whole lid swell. A chalazion can start as a stye that doesn’t fully clear. Warm compresses for 10 to 15 minutes several times a day help both conditions. Most styes resolve within a week.
Internal Eye Inflammation
Uveitis is inflammation inside the eye, and it’s a more serious cause of eye pain that often comes on without an obvious trigger. Symptoms include a deep aching pain, redness, light sensitivity, blurred vision, and dark floating spots in your field of vision. It can affect one or both eyes and sometimes develops gradually enough that you don’t notice it right away.
Uveitis matters because, left untreated, the ongoing inflammation can cause retinal swelling, scarring, glaucoma, cataracts, optic nerve damage, and permanent vision loss. It’s sometimes linked to autoimmune conditions. If you have eye pain alongside new floaters or a noticeable drop in vision clarity, getting an eye exam sooner rather than later is important.
Acute Glaucoma
Angle-closure glaucoma is rare, but it’s one of the true eye emergencies. It happens when fluid drainage inside the eye gets suddenly blocked, causing a rapid spike in internal eye pressure. The symptoms are hard to miss: severe eye pain, headache, nausea or vomiting, blurred vision, and seeing rainbow-colored halos around lights. The eye often looks visibly red.
This combination of intense eye pain plus nausea plus vision changes requires emergency care. Without treatment to lower the pressure quickly, permanent damage to the optic nerve can occur within hours.
Optic Neuritis
If your eye pain is a dull ache behind the eye that gets worse when you move your eye in any direction, optic neuritis is one possibility. This is inflammation of the optic nerve, the cable that carries visual signals from your eye to your brain. Along with pain during eye movement, it typically causes temporary vision loss in one eye and sometimes flashing or flickering lights when you look around.
Optic neuritis can occur on its own, but it’s also associated with autoimmune conditions that affect the nervous system. It usually improves over weeks, though it often needs medical management to protect long-term vision.
Pain That Isn’t Coming From the Eye
Sometimes what feels like eye pain actually originates somewhere else. Cluster headaches are a prime example. They cause extreme, sharp, stabbing pain in, behind, or around one eye, along with redness, tearing, a droopy eyelid, and a stuffy or runny nose on the affected side. The pain can spread to the face, head, and neck. Cluster headaches come in bouts (often at the same time each day for weeks), which helps distinguish them from eye problems.
Sinus infections can also produce pressure and aching around the eyes, particularly in the forehead and cheekbone areas. Migraines frequently center pain around or behind one eye. In all of these cases, the eye itself is healthy; the pain is referred from nearby structures.
Signs That Need Immediate Attention
Most eye pain is caused by something temporary and treatable. But certain combinations of symptoms signal a problem that can’t wait. You should seek emergency care if your eye pain is severe and accompanied by a headache, fever, or strong light sensitivity. The same goes if your vision changes suddenly, you feel nauseous or are vomiting, you see halos around lights, or you notice blood or pus coming from the eye. Difficulty moving the eye, inability to keep it open, and significant swelling in or around the eye socket are also red flags.
If a foreign object or chemical splash caused the pain, rinse the eye with clean water immediately and get evaluated, even if the pain starts to ease. Corneal damage from chemicals can worsen after the initial exposure.
Narrowing Down the Cause
When you’re trying to figure out what’s going on, a few questions help sort things out. Is the pain sharp and on the surface, or deep and aching? Did it start suddenly or build gradually? Is it in one eye or both? Does it get worse when you move your eye, blink, or look at light? Are there any vision changes, floaters, halos, or discharge?
Burning in both eyes that’s worse after screen time points toward dry eye. A sharp, gritty feeling in one eye after something may have gotten into it suggests a corneal scratch. A painful red bump on the eyelid is almost certainly a stye. Deep aching behind one eye that worsens with movement could be optic neuritis. And severe pain with nausea, halos, and blurred vision is the signature pattern of acute glaucoma. The specifics of how your eye hurts are often more useful than the pain alone.