Eye aching is most often caused by eye strain, particularly from screens, but it can also signal sinus problems, dry eyes, or less common conditions that need prompt attention. The cause usually becomes clear once you consider when the aching started, whether it’s in one eye or both, and what other symptoms come with it.
Screen Time Is the Most Common Culprit
Digital eye strain is far and away the leading reason for aching eyes in otherwise healthy people. When you look at a screen, your eyes are constantly refocusing to read text made of tiny pixels. You don’t notice it, but this rapid, repetitive focusing fatigues the small muscles inside and around your eyes. On top of that, screens typically have low contrast between text and background, which forces your eyes to work harder than they would reading print on paper.
There’s also a blinking problem. You normally blink about 15 to 20 times a minute, but that drops to roughly 3 to 7 times a minute when you’re staring at a screen. Worse, you may not fully close your eyelids during those reduced blinks. Since blinking is what spreads moisture across the surface of your eye, this means your eyes dry out, adding a stinging or burning sensation on top of the deeper muscular ache.
The fix is straightforward: follow the 20-20-20 rule. Every 20 minutes, look at something 20 feet away for 20 seconds. This lets the focusing muscles relax. Consciously blinking more often helps too, and preservative-free artificial tears can restore surface moisture without side effects. Redness-reducing drops, on the other hand, can actually worsen redness if used frequently.
Sinus Pressure Behind the Eyes
If your aching feels deep, like it’s behind the eye rather than on the surface, a sinus issue is a strong possibility. Your sinuses sit remarkably close to your eye sockets. The ethmoid sinuses, located between your nose and eyes, are separated from the orbit by a bone so thin it’s literally called the “paper wall.” The maxillary sinus forms the floor of your eye socket, and the frontal sinus sits just above the orbital roof.
When any of these sinuses become inflamed or infected, the pressure and swelling can radiate directly into the eye area. Patients often describe it as a deep ache behind the eye that worsens when bending forward. The sphenoid sinus, located farther back in the skull, is particularly notable: headache and pain behind the eye are significantly more common in people with sphenoid sinus disease. Unlike the dull facial pressure of typical sinusitis, orbital pain from sinus inflammation tends to feel sharper and may get worse when you move your eyes.
If your eye aching came on during or after a cold, is worse in the morning, or is accompanied by congestion and facial tenderness, sinus inflammation is likely involved.
Dry Eye and Environmental Factors
Dry eye doesn’t just cause a gritty or burning feeling. When the tear film breaks down, the nerves on your cornea become exposed and irritated, which can register as a dull, persistent ache. Air conditioning, heating, wind, low humidity, and contact lens wear all accelerate tear evaporation. Medications like antihistamines, antidepressants, and blood pressure drugs can also reduce tear production.
The aching from dry eye tends to be worse at the end of the day and in both eyes. Preservative-free artificial tears, used as often as needed, are the standard first step for relief.
Pain With Eye Movement
If the aching intensifies when you look up, down, or to the side, that narrows the possibilities. Optic neuritis, an inflammation of the nerve connecting your eye to your brain, causes pain with eye movement in over 90% of cases. It typically affects one eye and often comes with blurry vision or faded color perception. The pain usually resolves within days to weeks, and most people recover their vision within two weeks to three months.
Optic neuritis can be an isolated event or an early sign of a condition affecting the protective coating around nerves, so it warrants a medical evaluation even if the pain seems mild.
Tension Headaches and Migraines
Eye aching is a common companion to headaches, and sometimes the eye pain is the most noticeable part. Tension headaches often produce a band-like pressure that wraps around the forehead and settles behind both eyes. Migraines can cause intense throbbing around or behind one eye, often with light sensitivity, nausea, or visual disturbances like flashing lights or blind spots.
If your eye aching follows a predictable pattern (worse with stress, poor sleep, or certain foods) and comes with headache symptoms, the eyes themselves may not be the source of the problem.
Inflammation of the Eye Wall
The white part of your eye has layers, and inflammation at different depths produces different levels of pain. Episcleritis, inflammation of the outer layer, causes mild irritation and redness that usually resolves on its own. Scleritis, which affects the deeper layer, is a distinctly different condition. It produces severe, boring pain that can wake you from sleep and may radiate to the forehead, cheek, or jaw. The eye looks deeply red, sometimes with a bluish or violet tinge.
Scleritis is less common but more serious. It’s often associated with autoimmune conditions and can damage the eye if untreated.
When Eye Aching Is an Emergency
Most eye aching is benign, but certain combinations of symptoms require immediate care. Acute angle-closure glaucoma happens when fluid pressure inside the eye spikes suddenly. It causes severe eye pain, headache, nausea or vomiting, blurred vision, and seeing rainbow-colored halos around lights. The eye is often visibly red. This is a true emergency because permanent vision loss can occur within hours.
Seek emergency care if your eye pain is:
- Severe and accompanied by headache, fever, or light sensitivity
- Paired with sudden vision changes
- Causing nausea or vomiting
- Associated with swelling around the eye, trouble moving the eye, or inability to keep it open
- Accompanied by halos around lights
- Caused by a chemical splash or foreign object
Narrowing Down Your Cause
A few quick questions can help you sort out what’s going on. Is it both eyes or one? Both eyes points toward strain, dryness, or headache. One eye raises the possibility of something structural or inflammatory. Does it hurt more when you move your eyes? That suggests optic neuritis or sinus involvement near the back of the orbit. Did it come on gradually over days of heavy screen use, or suddenly? Gradual onset is typical of strain and dryness. Sudden, severe pain is more concerning.
How long the aching has lasted matters too. Strain-related aching should improve noticeably after a break from screens or a good night’s sleep. Aching that persists for days without an obvious trigger, worsens over time, or comes with vision changes is worth getting evaluated.