Pain behind the eye has many possible causes, ranging from common headache disorders to sinus infections to rare but serious eye conditions. The location of the pain, how long it lasts, and whether it comes with vision changes or other symptoms are the biggest clues to what’s going on.
Migraine
Migraine is one of the most common reasons people feel deep, throbbing pain behind one eye. The pain typically builds over minutes to hours, lasts anywhere from 4 to 72 hours, and often comes with nausea, sensitivity to light and sound, or visual disturbances like flickering lights or blind spots (called an aura). Unlike some other causes on this list, migraine pain tends to pulse or throb and gets worse with physical activity. You might also notice it switches sides between episodes.
If you’ve had recurring bouts of one-sided pain behind the eye that come with light sensitivity or nausea, migraine is a strong possibility, especially if you have a family history. Keeping a headache diary that tracks when attacks happen, what you ate, how you slept, and your stress level can help you and a doctor identify triggers and confirm the pattern.
Cluster Headaches
Cluster headaches produce some of the most intense pain a person can experience. The pain is extreme, sharp or stabbing, and centered in, behind, or around one eye. It can spread to other areas of the face, head, and neck. Unlike migraine, where most people want to lie still in a dark room, cluster headache pain makes people restless. Pacing, rocking back and forth, or feeling unable to sit still is characteristic.
A single attack lasts 15 minutes to 3 hours, though most run about 30 to 45 minutes. The pain ends as suddenly as it begins. What makes cluster headaches distinctive is the pattern: attacks come daily, often several times a day, frequently at the same time each day. Most strike at night, typically one to two hours after you fall asleep. These daily episodes continue for weeks to months (a “cluster period”), then disappear entirely for three months or longer before returning.
During an attack, the affected eye often tears up, turns red, or swells. The eyelid may droop. You might get a stuffy or runny nose on that same side, or notice sweating on your forehead. If that combination of symptoms sounds familiar, cluster headache is worth discussing with a neurologist.
Sinus Infections
Most people associate sinus infections with a stuffy nose and facial pressure around the cheeks, but the sinuses closest to your eyes can create deep pain that feels like it’s behind the eyeball. Your sphenoid sinuses sit behind the upper part of your nasal cavity, roughly in the center of your head, right next to the optic nerve. When these sinuses become infected or inflamed, the symptoms are unusual compared to a typical sinus infection.
A sphenoid sinus infection often skips the classic stuffy or runny nose entirely. Instead, you’re more likely to notice headaches, facial pain or numbness, sensitivity to light, double vision, or even vision loss. Usually, when the sphenoid sinuses are infected, nearby sinuses like the ethmoid and frontal sinuses are involved too, so you may have a mix of typical and atypical sinus symptoms.
If your behind-the-eye pain started during or after a cold, feels worse when you bend forward, and comes with facial pressure or thick nasal discharge, a sinus infection is a likely culprit. Most resolve with time and supportive care, though bacterial infections sometimes need antibiotics.
Eye Strain
Prolonged screen use, reading in poor lighting, or an outdated glasses prescription can all cause a dull ache behind the eyes. The pain tends to be on both sides, worsens as the day goes on, and improves after you rest your eyes. You might also notice dry eyes, blurry vision, or tension in the forehead and temples. This is one of the most common and least worrisome causes. If your pain reliably shows up after hours of screen work and disappears after a break, eye strain is the most likely explanation. The fix is straightforward: take regular breaks (looking at something 20 feet away for 20 seconds every 20 minutes is a good rule), adjust your screen brightness, and get your prescription checked if it’s been a while.
Optic Neuritis
Optic neuritis is inflammation of the nerve that connects your eye to your brain. The hallmark symptom is eye pain that gets worse when you move your eyes, paired with vision loss that develops over hours to days. Most people notice at least some reduction in vision, though the severity varies widely. Colors may look washed out, and vision in one eye may dim noticeably.
The good news is that vision typically improves over several weeks to months, though it’s permanent in some cases. Optic neuritis is sometimes an early sign of multiple sclerosis or other autoimmune conditions, so doctors usually recommend an MRI to check for related changes in the brain. If your pain behind the eye is clearly triggered by eye movement and you’re noticing any vision changes, this warrants prompt evaluation.
Thyroid Eye Disease
People with an overactive thyroid, particularly Graves’ disease, can develop swelling and inflammation inside the eye socket. The immune system targets tissues behind the eye, causing fat to accumulate and the muscles that move the eye to enlarge. This creates pressure in a space that has very little room to spare. The result can be a feeling of fullness or aching behind the eye, eyes that appear to bulge forward, double vision, and in severe cases, compression of the optic nerve that threatens vision.
If you have a known thyroid condition and develop pain or pressure behind one or both eyes, or if others have noticed your eyes look more prominent, thyroid eye disease should be on the radar. It can also occasionally appear before thyroid problems are diagnosed, so unexplained eye bulging or double vision is worth getting bloodwork for.
Acute Angle-Closure Glaucoma
This is one of the causes that requires emergency care. Acute angle-closure glaucoma happens when the drainage system inside the eye gets suddenly blocked, causing pressure to spike rapidly. The symptoms are hard to miss: severe eye pain, a bad headache, nausea or vomiting, blurred vision, halos or colored rings around lights, and eye redness. It typically affects one eye at a time.
This condition can permanently damage vision within hours if untreated. If you develop sudden, severe eye pain with vision changes, especially halos around lights and nausea, go to an emergency room. Treatment involves bringing the eye pressure down quickly, which usually requires in-hospital care.
Trigeminal Neuralgia
The trigeminal nerve carries sensation from your face to your brain, and when it misfires, it can cause sudden, intense jolts of pain that feel like an electric shock. While this condition most commonly affects the cheek and jaw areas, it can less commonly involve the eye and forehead. The pain is distinct: it comes in episodes lasting a few seconds to several minutes, can be triggered by touching the face, chewing, speaking, or even brushing your teeth, and tends to affect one side only. Over time, episodes often become more frequent and intense. The pain rarely occurs during sleep.
When the Pain Points to Something Serious
Most behind-the-eye pain turns out to be a headache disorder, sinus issue, or eye strain. But certain combinations of symptoms signal something that needs urgent attention. Sudden vision loss or blurring paired with eye pain, the appearance of halos around lights, nausea and vomiting alongside eye pain, a visibly bulging eye, inability to move the eye normally, or a fixed (non-reactive) pupil are all reasons to seek immediate care.
For pain that’s less dramatic but keeps coming back, an eye doctor can measure the pressure inside your eye, examine the internal structures with a slit lamp, and check how well your optic nerve is functioning. If there’s concern about what’s happening behind the eye, CT or MRI scans can provide detailed views of the eye socket, surrounding bone, and optic nerve to look for inflammation, tumors, or other structural problems.
Paying attention to the pattern of your pain is the most useful thing you can do before an appointment. Note which side hurts, how long episodes last, what makes the pain better or worse, and any accompanying symptoms like vision changes, tearing, nasal congestion, or nausea. That information narrows the possibilities faster than any single test.