Eye pain has dozens of possible causes, ranging from something as minor as a tired muscle to something as urgent as a pressure spike inside the eye. The type of pain you feel, where exactly you feel it, and what other symptoms come with it are the best clues to narrowing down what’s going on.
Dry Eyes and Screen Fatigue
These are the two most common reasons for everyday eye discomfort, and they often overlap. Your eye’s surface needs a continuous, unbroken layer of tears to stay healthy. When that tear film breaks down too quickly, exposed surface cells dry out, leading to tissue damage and inflammation. The result is a gritty, burning, or stinging sensation that tends to get worse as the day goes on, especially in air-conditioned rooms or windy environments.
Prolonged screen use makes this worse in two ways. First, you blink less when staring at a screen, which lets your tear film evaporate faster. Second, the muscles inside your eye that control focus and pupil size can spasm after intense close-up work. That combination of dryness and muscle fatigue is what eye doctors call digital eye strain. If your pain feels like a dull ache or tiredness behind the eyes after hours on a computer or phone, this is the most likely explanation.
Something on or in Your Eye
A corneal abrasion, which is a scratch on the clear front surface of your eye, causes sharp pain that’s hard to ignore. Common culprits include a fingernail, a grain of sand, or even the edge of a contact lens. Along with the pain, you’ll typically notice watery eyes, light sensitivity, redness, and a persistent feeling that something is stuck in your eye even after the object is gone. Minor scratches usually heal within 24 to 48 hours, but deeper abrasions or anything involving metal or chemicals needs professional attention quickly to prevent infection or scarring.
Contact lens wearers face a specific risk: bacterial keratitis, an infection of the cornea. Overnight wear raises the risk significantly. If you wear contacts and develop increasing pain, redness, or discharge, remove your lenses and get evaluated the same day. Corneal infections can threaten your vision if left untreated.
Sinus Pressure and Referred Pain
Not all eye pain actually starts in the eye. The sinuses sit directly behind and around your eye sockets, so when they’re inflamed or infected, you can feel deep, aching pressure that seems to come from behind the eye itself. This kind of pain typically gets worse when you bend forward, comes with nasal congestion, and may follow a cold. In rare cases, a severe sinus infection can spread into the eye socket, causing the eye to bulge forward or limiting how well it moves. Any combination of sinus symptoms with vision changes or restricted eye movement needs urgent evaluation.
Inflammation Inside the Eye
Pink eye (conjunctivitis) is the most familiar form of eye inflammation: red, swollen, watery eyes, often with crusty discharge. It’s usually more irritating than painful and rarely affects your vision. Deeper inflammation is a different story.
Uveitis occurs when the middle layer of the eyeball becomes inflamed. It causes redness, light sensitivity, blurry vision, and dark floaters drifting across your field of view. The pain can range from mild to significant. Unlike pink eye, uveitis can damage your vision if untreated, and it sometimes signals an underlying autoimmune condition. If your eye is red and painful with blurred vision or floaters, that combination points toward something more serious than a surface infection.
Pain That Worsens With Eye Movement
If the pain sharpens specifically when you look up, down, or to the side, the optic nerve may be inflamed. This condition, called optic neuritis, causes a dull ache behind the eye that gets noticeably worse with movement. It often comes with some degree of vision loss, faded colors, or a dim spot in your visual field. Optic neuritis can be an early sign of multiple sclerosis in some people, so it’s worth getting checked promptly even if the pain feels manageable.
Cluster Headaches and Migraines
Cluster headaches produce some of the most intense eye pain you can experience. The pain is sharp or stabbing, centered in, behind, or around one eye, and it can radiate across the face and neck. A single attack lasts anywhere from 15 minutes to 3 hours, though most run 30 to 45 minutes. During an attack, the affected eye often turns red, waters heavily, and the eyelid may droop or swell.
What makes cluster headaches distinctive is their pattern. They strike daily, often several times a day, frequently at the same time each night (typically one to two hours after you fall asleep). These cycles last weeks to months before entering a pain-free remission period of three months or longer. If your eye pain follows a clock-like schedule and comes with tearing and nasal congestion on the same side, cluster headaches are a strong possibility.
Migraines can also cause pain around or behind one eye, but they tend to bring throbbing rather than stabbing pain, along with nausea, light sensitivity, and sometimes visual auras like zigzag lines or blind spots.
Sudden Pressure Buildup (Acute Glaucoma)
Acute angle-closure glaucoma is a true eye emergency. It happens when fluid inside the eye gets trapped, causing pressure to spike rapidly. The symptoms are hard to miss: severe eye pain, a visibly red eye, blurred vision, halos or rainbow-colored rings around lights, headache, and nausea or vomiting. This combination can develop in minutes to hours and causes permanent vision damage if not treated quickly.
It’s more common in people over 60, those who are farsighted, and people of East Asian descent. If you experience sudden, severe eye pain with nausea or vision changes, go to an emergency room.
How to Tell What’s Serious
A few key red flags separate “wait and see” eye pain from pain that needs same-day or emergency care:
- Vision loss or sudden blurriness alongside eye pain suggests something beyond surface irritation.
- Severe light sensitivity that makes it difficult to keep your eye open often points to inflammation inside the eye or a significant corneal injury.
- Halos around lights combined with pain and nausea can indicate acute glaucoma.
- Pain with eye movement and dimmed or faded vision suggests optic nerve involvement.
- A bulging eye or inability to move the eye normally can mean an infection has spread into the orbit.
Mild, bilateral discomfort that improves with rest and lubricating eye drops is almost always benign. Pain that is severe, one-sided, or paired with any of the symptoms above has a higher chance of being something that needs treatment before it causes lasting harm.