Eye pain has dozens of possible causes, ranging from something as simple as a dry or tired eye to something as urgent as a sudden spike in pressure inside the eye. The type of pain you feel is the single best clue to what’s going on: a sharp, gritty, surface-level sting points to problems on the front of the eye, while a deep, aching throb behind the eye suggests something deeper in the socket or even a headache disorder.
Surface Pain vs. Deep Pain
The eye has two broad zones where pain originates, and they feel distinctly different. Problems with the cornea, the clear front window of the eye, typically cause sharp, stinging pain along with a foreign-body sensation, tearing, and sensitivity to light. You might instinctively want to keep the eye shut. This is the kind of pain you get from a scratch, a stray eyelash, or an inflamed contact lens.
Deep, boring, aching pain that feels like it’s behind the eyeball usually comes from the orbit, the bony socket and soft tissue surrounding the eye. Orbital problems can also cause the eye to bulge slightly, restrict eye movement, or produce double vision. This type of pain is more likely to signal inflammation, infection deeper in the socket, or a neurological cause like a headache disorder.
Dry Eye and Screen Fatigue
Dry eye disease is one of the most common reasons for day-to-day eye discomfort. Global estimates put its prevalence anywhere from 5% to over 50% of the population, with higher rates in older adults, women, contact lens wearers, and people living in dry or windy climates. The core problem is a tear film that either evaporates too fast or isn’t produced in sufficient volume. That leaves the surface of the eye exposed, triggering inflammation, a gritty or burning sensation, and sometimes blurry vision that clears temporarily when you blink.
Screen time makes this worse. When you read on a computer or phone, your eyes constantly focus and refocus on tiny pixels, and your blink rate drops significantly. Over hours, the combination of reduced blinking and sustained close-focus work fatigues the muscles inside the eye. The standard recommendation is the 20-20-20 rule: every 20 minutes, look at something at least 20 feet away for about 20 seconds. Preservative-free artificial tears can also help. If you use drops more than a few times a day, preservative-free formulations are the better choice because preserved drops can irritate an already compromised eye surface over time.
Corneal Scratches and Infections
A corneal abrasion, a scratch on the surface of the eye, is extremely painful relative to its size. You might get one from a fingernail, a tree branch, dust, or a contact lens that shifts. The hallmark symptoms are sharp pain, heavy tearing, light sensitivity, and the persistent feeling that something is stuck in your eye even after it’s gone. Most small abrasions heal within a day or two.
The concern is what can follow. A scratch creates an opening in the cornea’s protective barrier. If bacteria, fungi, or other microorganisms get into that opening, the result is infectious keratitis, a corneal infection that causes redness, worsening pain, discharge, and blurred or decreased vision. Contact lens wearers are at higher risk, especially those who sleep in lenses or rinse them with tap water. Non-infectious keratitis can also develop simply from wearing contacts too long or getting a foreign particle lodged against the eye. Any eye pain that comes with cloudy or worsening vision, pus-like discharge, or increasing redness over 24 hours needs prompt attention.
Pressure Buildup Inside the Eye
Normal pressure inside the eye falls between 10 and 20 mmHg. In acute angle-closure glaucoma, the drainage system of the eye suddenly blocks, and pressure climbs rapidly. This is one of the true emergencies in eye care. It produces intense pain, often with nausea or vomiting, blurred vision, and the characteristic symptom of seeing rainbow-colored halos around lights. The affected eye may look red, and the pupil can appear fixed or mid-dilated.
Acute angle-closure glaucoma is more common in people over 60, those who are farsighted, and people of East Asian or Southeast Asian descent. It can be triggered by dim lighting, certain medications that dilate the pupil, or stress. Without treatment to lower the pressure quickly, permanent vision loss can occur within hours.
Inflammation Linked to Other Conditions
Uveitis is inflammation of the middle layer of the eye wall. It can cause a dull ache, redness, light sensitivity, and floaters. What makes uveitis notable is how often it connects to conditions elsewhere in the body. Inflammatory bowel disease, lupus, rheumatoid arthritis, psoriasis, ankylosing spondylitis, sarcoidosis, and multiple sclerosis all carry an elevated risk of uveitis. If you have one of these conditions and develop new eye pain, that connection is worth mentioning to your doctor promptly. Uveitis can also appear on its own without any underlying disease.
Headache Disorders That Target the Eye
Two headache types are notorious for producing pain in or around the eye: cluster headaches and migraines.
Cluster headaches hit one side of the head, typically at the temple or directly around the eye. They are intensely painful, last about 30 to 90 minutes each, and can recur up to eight times in a single day. The affected eye usually turns red and tears heavily, and the nostril on the same side may become congested. People in the middle of a cluster attack tend to pace or rock rather than lie still.
Migraines can also center behind the eye, though the pain may spread across the head. They last much longer, often an entire day or multiple days if untreated, and are more likely to cause nausea, vomiting, and a strong desire to retreat to a dark, quiet room. Some migraines include visual disturbances like flashing lights or blind spots, which appear before or during the headache phase. If your eye pain follows a predictable pattern of attacks with these features, a headache disorder is a likely explanation.
Red Flags That Need Immediate Care
Most eye pain resolves on its own or with simple measures like rest, artificial tears, or removing a contact lens. But certain combinations of symptoms signal something that can threaten your vision or indicate a serious underlying problem. Seek emergency care if your eye pain comes with any of the following:
- Sudden vision changes, including blurriness that won’t clear or partial vision loss
- Halos around lights, especially with nausea or vomiting
- Severe pain with headache, fever, or extreme light sensitivity
- A chemical splash or foreign object that won’t flush out
- Swelling in or around the eye
- Inability to open or move the eye normally
- Blood or pus coming from the eye
Eye pain that is mild, came on gradually, and isn’t paired with vision changes is far less likely to be an emergency. But pain that is new, worsening, or accompanied by any of the symptoms above warrants same-day evaluation rather than a wait-and-see approach.