Pain behind your right eye can come from dozens of different sources, ranging from something as simple as screen fatigue to conditions that need urgent attention. The location feels specific and alarming, but it doesn’t automatically point to a problem with the eye itself. Pain in this area often originates from surrounding structures like sinuses, blood vessels, or nerves that happen to pass through the tight space behind your eyeball.
Digital Eye Strain
The most common and least worrisome explanation is prolonged screen use. When you stare at a computer, phone, or tablet, your eyes are constantly focusing and refocusing on tiny pixels. That repetitive effort strains the muscles behind your eyes. You also blink about a third less often than normal while looking at a screen, which dries the surface of your eyes and adds to the discomfort. The result is an aching, pressure-like sensation that tends to sit right behind one or both eyes.
If your pain shows up after hours of screen work and fades when you step away, this is the likely culprit. The standard recommendation is the 20-20-20 method: every 20 minutes, look at something 20 feet away for 20 seconds. Adjusting your screen’s brightness and contrast so text is easier to read also reduces the effort your eyes are putting in.
Cluster Headaches
Cluster headaches are one of the most distinctive causes of pain behind a single eye. The pain is severe, often described as a burning or piercing sensation on one side, and it reaches full intensity within 5 to 10 minutes. Individual attacks last anywhere from 15 minutes to 3 hours, with the worst pain typically lasting 30 minutes to 2 hours.
What makes cluster headaches recognizable is their pattern. They tend to strike at the same time each day, often waking people from sleep, and they occur in “clusters” that last weeks or months before disappearing. During an attack, the eye on the affected side may water excessively, turn red, or develop a droopy lid. Your nose may run or feel congested on that same side, and your face may flush and sweat. If this matches what you’re experiencing, it’s worth knowing these headaches respond to specific treatments that ordinary painkillers don’t provide.
Sinus Inflammation
Your sphenoid sinuses sit deep in the skull, directly behind your eyes. When they become inflamed or infected, the pain feels like deep, constant pressure behind one or both eyes. This location is what makes sphenoid sinusitis tricky: it mimics migraines. Both conditions activate the same nerve pathway, the trigeminal nerve, which is why the pain can feel almost identical.
Sinus-related eye pain usually comes with other clues. You might have nasal congestion, postnasal drip, a low-grade fever, or pain that worsens when you bend forward. If your pain behind the eye started during or after a cold or respiratory infection, inflamed sinuses are a strong possibility.
Migraines
Migraines frequently produce pain that settles behind one eye. The pain is typically throbbing or pulsating, lasts 4 to 72 hours, and tends to worsen with physical activity, bright lights, or loud sounds. Some people experience an aura beforehand, seeing flashing lights, zigzag lines, or temporary blind spots.
Migraines can affect the same side consistently, so if your pain is always behind the right eye, that’s not unusual. Nausea is common during attacks, and many people find they need to lie down in a dark, quiet room until it passes.
Optic Neuritis
Optic neuritis is inflammation of the optic nerve, which runs from the back of your eye to your brain. Over 90% of people with this condition experience pain that gets noticeably worse when they move their eyes. If looking left, right, up, or down sharpens the ache behind your eye, this is a pattern worth paying attention to.
Along with pain during eye movement, optic neuritis typically causes changes in vision: colors may look washed out, you might notice a blurry or dim patch in your visual field, or your overall vision in that eye may decline over days. This condition is sometimes linked to autoimmune disorders, and diagnosis usually involves an MRI to look at the optic nerve directly. Most people recover significant vision over weeks to months, but the underlying cause matters for long-term management.
Acute Angle-Closure Glaucoma
This is one of the more urgent causes of pain behind the eye. It happens when fluid drainage inside the eye gets suddenly blocked, causing pressure to spike. The pain is intense and comes on quickly. You may also notice blurred vision, see rainbow-colored halos around lights, and feel nauseous or even vomit.
Acute angle-closure glaucoma is a medical emergency because sustained high pressure inside the eye can permanently damage the optic nerve within hours. If you have sudden, severe eye pain with vision changes and nausea, this needs immediate evaluation.
Thyroid Eye Disease
People with thyroid conditions, particularly an overactive thyroid, can develop inflammation in the tissues behind their eyes. The immune system produces antibodies that target not only the thyroid but also receptors in the tissue surrounding the eyes. This causes swelling of the muscles and fat behind the eyeball, creating a sensation of pressure or aching. In more advanced cases, the eyes may visibly bulge forward, and you might have difficulty moving them comfortably.
If you have a known thyroid condition, or if your eye pain comes with unexplained weight changes, a rapid heartbeat, or heat intolerance, the connection is worth exploring.
Carotid Artery Dissection
Rarely, pain behind the eye signals a tear in the inner wall of the carotid artery, the major blood vessel running up the side of your neck toward your brain. This tear causes constant, dull pain behind the eye on the affected side that may radiate to the jaw. A telltale sign is a combination of a drooping eyelid, a smaller pupil, and reduced sweating on that side of the face. The affected pupil will also be slow to widen in dim light.
This is an uncommon cause, but it’s serious because it can lead to stroke. It sometimes follows neck trauma, chiropractic manipulation, or even forceful coughing or sneezing.
When the Pain Needs Emergency Care
Most behind-the-eye pain resolves on its own or points to something manageable. But certain combinations of symptoms signal that something more dangerous may be happening. Seek emergency care if your eye pain is severe and accompanied by a headache, fever, or increased sensitivity to light. Sudden vision changes, nausea or vomiting alongside the pain, seeing halos around lights, swelling in or around the eye, difficulty moving the eye, or an inability to keep it open all warrant immediate attention.
Pain that is mild and linked to screen use or a known sinus infection is generally safe to monitor. Pain that is sudden, severe, or paired with any neurological symptoms like vision loss, pupil changes, or facial drooping belongs in an emergency room.
How Doctors Identify the Cause
Because so many conditions can produce pain in the same spot, the diagnostic process depends heavily on your other symptoms. A thorough eye exam checks visual sharpness, color vision, pupil reflexes, and eye pressure. If glaucoma is suspected, a pressure measurement inside the eye is the key test. For suspected optic neuritis or any concern about structures deeper in the skull, an MRI with contrast is the standard imaging tool, since it reveals inflammation and tissue changes that CT scans can miss. Blood work may be ordered to check for thyroid antibodies or signs of infection.
The pattern of your pain provides some of the most useful diagnostic information. Keeping track of when it starts, how long it lasts, what makes it better or worse, and what other symptoms accompany it gives your doctor a significant head start in narrowing down the cause.