Eye pain has dozens of possible causes, ranging from a dry eye or a small scratch on the surface to serious conditions like glaucoma that need same-day treatment. 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.
Surface Pain vs. Deep Pain
The single most useful distinction is whether the pain feels like it’s on the surface of your eye or deeper behind it. A scratchy, gritty, or foreign-body sensation typically points to something affecting the eyelid, the clear outer layer of the eye (the cornea), or the thin membrane lining the white of your eye. This kind of pain often gets worse when you blink.
A deeper ache or throb, on the other hand, usually signals something more serious: glaucoma, inflammation inside the eye, or an infection of the tissue around the eye socket. If the pain is deep and came on suddenly, especially with vision changes, that generally warrants urgent care rather than a wait-and-see approach.
Common Causes of Surface Eye Pain
Corneal Abrasion
A scratch on the cornea is one of the most common reasons for sudden, sharp eye pain. It can happen from a fingernail, a contact lens, dust, or even rubbing your eye too hard. The hallmark is a stinging or burning sensation that gets noticeably worse when you blink or look at bright light. Minor scratches heal quickly because corneal cells reproduce fast. Most people feel significantly better within 24 to 48 hours, though larger scratches take longer. An eye care provider will typically prescribe antibiotic drops or ointment to prevent infection while the surface heals.
Dry Eye
If your eyes feel sandy, tired, or irritated, particularly after long stretches of screen time or in dry indoor air, dry eye is a likely culprit. Your eyes either aren’t producing enough tears or the tears evaporate too quickly. The pain tends to be mild but persistent and often worsens through the day. Over-the-counter artificial tears help most mild cases. If the discomfort doesn’t improve after a couple of weeks of regular use, it’s worth getting evaluated for an underlying cause.
Conjunctivitis (Pink Eye)
Pink eye causes redness, irritation, and discharge, and the type of discharge helps identify what’s behind it. Bacterial conjunctivitis produces thick, yellow or green pus that mats your eyelids together overnight. It usually needs antibiotic drops. Viral conjunctivitis causes watery discharge and often starts in one eye before spreading to the other within a day or two. Most viral cases clear on their own without antibiotics. Allergic conjunctivitis tends to cause intense itching in both eyes at the same time, along with watery eyes and sometimes a runny nose. The overlap between these types can make it hard to tell them apart without an exam.
Styes
A stye is a small, tender bump on the eyelid caused by a blocked oil gland that gets infected. It looks like a pimple, hurts when you touch it, and can make the whole eyelid feel swollen and sore. The standard home treatment is a warm compress: moisten a clean washcloth with warm water and hold it gently over the affected eye for five minutes, several times a day. Most styes drain and resolve on their own within a week. Don’t try to squeeze or pop one, as that can spread the infection.
Causes of Deep or Severe Eye Pain
Acute Angle-Closure Glaucoma
This is the one eye pain scenario that’s a true emergency. It happens when the drainage system inside the eye gets suddenly blocked, causing pressure to spike rapidly. The symptoms are hard to miss: severe pain in one eye, a rock-hard feeling in the eyeball, blurred vision, seeing rainbow-colored halos around lights, a red eye, and often nausea or vomiting from the intensity of the pain. It can also cause a headache on the same side. Without treatment within hours, the high pressure can permanently damage the optic nerve. If this combination of symptoms hits you, go to an emergency room immediately.
Uveitis
Uveitis is inflammation of the middle layer of tissue inside the eye. It causes a deep, aching pain along with redness, light sensitivity, and blurred vision. Because there isn’t much room inside the eyeball for tissue to swell, even mild inflammation can distort your vision. In severe cases, it can lead to permanent vision loss. Between 50% and 70% of uveitis cases have no identifiable cause, but the rest are linked to autoimmune conditions, infections, or eye injuries. Treatment focuses on controlling the inflammation quickly to prevent lasting damage.
Orbital Cellulitis
This is an infection of the tissue surrounding the eye, often spreading from a sinus infection. The telltale signs are a swollen, red eyelid that may be difficult to open, pain with eye movement, fever, and sometimes the eye itself looks pushed forward. This condition can progress rapidly and needs treatment the same day.
Sinusitis
Sinus infections cause pressure and aching pain around or behind the eyes, particularly between the eyebrows or in the cheekbone area. The pain often worsens when you bend forward. If your “eye pain” comes with nasal congestion, thick nasal discharge, and a feeling of fullness in your face, the sinuses are the more likely source than the eye itself.
Eye Strain From Screens and Reading
Digital eye strain is probably the most common reason people search “why does my eye hurt.” The pain is typically a dull ache behind both eyes, sometimes paired with a headache across the forehead, blurry vision at the end of the day, or neck and shoulder tension. It happens because your focusing muscles fatigue from holding the same close-range focus for hours.
The fix is straightforward: follow the 20-20-20 rule. Every 20 minutes, look at something about 20 feet away for 20 seconds. This gives your focusing muscles a break. Adjusting your screen so it sits about an arm’s length away and slightly below eye level also helps. If you wear glasses, your prescription may need updating, since even a small error forces your eyes to work harder all day.
Contact Lens Problems
Contact lenses are a frequent source of eye pain, especially when worn too long, slept in, or not cleaned properly. Overwearing lenses starves the cornea of oxygen, leading to redness, irritation, and a gritty feeling. In more serious cases, bacteria can get trapped under the lens and cause a corneal ulcer, which feels like a sharp, constant pain with light sensitivity and sometimes a visible white spot on the eye. Contact lens wearers with bacterial infections are at higher risk of developing these ulcers and need prompt evaluation. If your eye hurts and you wear contacts, take them out first. If the pain doesn’t start improving within an hour or two, get it checked.
Red Flags That Need Immediate Care
Most eye pain is minor and resolves with basic care or a short course of treatment. But certain combinations of symptoms signal a problem that can threaten your vision if not treated quickly. Seek emergency care if your eye pain comes with any of the following:
- Sudden vision changes or vision loss
- Seeing halos around lights
- Nausea or vomiting alongside the pain
- Severe pain with headache, fever, or extreme light sensitivity
- Swelling in or around the eye
- Difficulty moving the eye or keeping it open
- Blood or pus coming from the eye
- Pain after a chemical splash or an object striking the eye
Eye pain that’s mild, started gradually, and isn’t getting worse can usually wait for a regular appointment. Pain that’s severe, sudden, or paired with vision changes is a different situation entirely, and getting it evaluated the same day can make the difference between a full recovery and lasting damage.