Aching eyeballs usually come from one of a handful of common causes: digital eye strain, dry eyes, sinus pressure, or a refractive error like an outdated glasses prescription. Less often, the ache signals something more serious, like elevated eye pressure or inflammation inside the eye itself. The cause matters because some types of eye aching resolve on their own, while others need prompt treatment to protect your vision.
Digital Eye Strain
The most common reason your eyeballs ache is prolonged screen use. When you read on a digital screen, your eyes are constantly focusing and refocusing on tiny pixels without you realizing it. That repetitive effort fatigues the muscles inside and around your eyes, producing a deep, tired ache. At the same time, you blink less while staring at a screen, which dries the surface of your eyes and adds a gritty, burning layer to the discomfort.
Low contrast between text and background on screens also forces your eyes to work harder than they would reading printed text. The combination of reduced blinking, constant refocusing, and low contrast is why the ache tends to build over hours and feel worst by late afternoon. Taking breaks, increasing text size, and using artificial tears to compensate for reduced blinking can make a noticeable difference.
Dry Eye
Even outside of screen time, dry eyes are a frequent source of aching. Your tear film protects and lubricates the surface of the eye, and when it breaks down, exposed nerve endings on the cornea send pain signals that can feel like a dull ache, burning, or foreign body sensation. Dry environments, contact lens wear, aging, and certain medications all reduce tear quality or quantity. The ache from dry eye often worsens with wind, air conditioning, or long periods of concentration (reading, driving) because all of these reduce your blink rate.
Sinus Pressure and Referred Pain
Your sinuses sit directly behind and above your eye sockets, so inflammation in those cavities can create pressure that feels like it’s coming from your eyeballs themselves. The mechanism behind this is a major nerve called the trigeminal nerve. Its first branch innervates the sinuses, the blood vessels around the brain, and the tissues in and around the eye. When the sinuses are inflamed, pain signals travel along that shared nerve pathway and get “referred” to the eye area.
There’s an important catch, though. Many people who believe they have sinus headaches actually have migraines. A large study of 100 people who self-diagnosed sinus headache found that only 3% had headaches genuinely related to sinus infection. The majority, about 75%, turned out to have migraine or probable migraine. If your eye aching comes with congestion but no fever, no thick discolored mucus, and no recent upper respiratory infection, migraine is a more likely explanation than sinusitis.
Refractive Errors and Outdated Prescriptions
If you need glasses or contacts and don’t have them, or if your current prescription is no longer accurate, your eye muscles strain to compensate. This produces a deep ache that typically worsens with tasks requiring sustained focus, like reading or driving. The fix is straightforward: an updated eye exam and corrected lenses usually eliminate the pain entirely. This is especially common in people over 40 as the lens inside the eye becomes less flexible.
Migraines and Cluster Headaches
Migraines frequently center pain behind or around one or both eyes. The ache can be throbbing or steady and often comes with light sensitivity, nausea, or visual disturbances like flashing lights. Because the trigeminal nerve is involved in migraine as well as sinus pain, the overlap in location can make these hard to tell apart without looking at the full picture of symptoms.
Cluster headaches are rarer but produce intense pain specifically in and around one eye. The pain is burning, sharp, or stabbing, reaches peak intensity within 5 to 10 minutes, and lasts anywhere from 15 minutes to 3 hours. Attacks happen daily or near-daily for weeks or months at a time. A hallmark of cluster headache is autonomic symptoms on the same side as the pain: a red, teary eye, a droopy eyelid, a runny or stuffy nostril, and facial flushing or sweating. If your aching eye also has these features, cluster headache is worth discussing with a doctor.
Elevated Eye Pressure
Normal pressure inside the eye falls between 10 and 20 mmHg. When fluid inside the eye doesn’t drain properly, pressure rises and can produce a deep ache. In the chronic form of angle-closure glaucoma, this might show up as mild eye discomfort or a brow ache that comes and goes. The acute form is a medical emergency: pressure spikes suddenly, causing severe eye pain, headache, nausea, vomiting, and halos around lights. Vision can be permanently damaged within hours if acute angle-closure isn’t treated.
You can’t feel your own eye pressure, and chronic elevations often produce no symptoms at all until vision loss has already occurred. This is one of the main reasons routine eye exams include a pressure check.
Optic Neuritis
If your eye aches specifically when you move it, optic neuritis is one possible explanation. This condition involves inflammation of the nerve that connects the eye to the brain. Most people with optic neuritis notice pain that worsens with eye movement, along with blurred vision or dimmed color perception in one eye. It most commonly affects adults between 20 and 40, and women develop it more often than men. Optic neuritis can be an early sign of multiple sclerosis, so it warrants a thorough neurological workup.
Inflammation of the Eye Wall
The white outer shell of your eye, the sclera, can become inflamed in a condition called scleritis. This produces a deep, boring ache that can wake you from sleep, often with visible redness. Scleritis is not just surface irritation. It involves deeper layers of the eye wall and is frequently associated with autoimmune conditions like rheumatoid arthritis. A milder, more superficial cousin called episcleritis causes redness and mild discomfort but is far less serious. The two are distinct conditions, not just different severities of the same problem.
Contact Lens Problems
Wearing contact lenses increases your risk of eye pain from multiple directions. Lenses reduce oxygen flow to the cornea, worsen dry eye, and can harbor bacteria if not cleaned properly. Overwearing contacts, sleeping in lenses not designed for overnight use, or using expired solution can all produce a deep ache accompanied by redness or light sensitivity. If you wear contacts and your eyes ache, removing the lenses is the first step. If the pain doesn’t improve within a few hours, an infection or corneal abrasion may be developing.
When Eye Aching Is an Emergency
Most causes of aching eyeballs are not emergencies, but certain combinations of symptoms require immediate care. Seek emergency attention if your eye pain is severe and accompanied by a headache, fever, or increased light sensitivity. Sudden vision changes, nausea or vomiting alongside eye pain, seeing halos around lights, or an inability to move or open your eye all warrant urgent evaluation. Blood or pus coming from the eye, swelling around the eye, or pain caused by a chemical splash or foreign object also need same-day treatment.
The key distinction is between a dull, chronic ache that comes and goes with screen use or fatigue, and pain that is new, severe, or paired with vision changes. The first is common and usually manageable. The second needs professional evaluation before you can rule out pressure problems, infection, or inflammation that could threaten your sight.