A headache behind your right eye is almost always caused by one of a handful of common conditions: migraine, cluster headache, tension headache, or sinus inflammation. The pain feels localized because a major nerve called the trigeminal nerve has a branch that provides sensation to the area between your scalp and upper eyelids, including the tissue around your eye and the membranes lining your brain. When that nerve pathway gets activated or irritated, the result is focused, sometimes intense pain that can feel like it’s pressing from deep inside or directly behind the eye socket.
The fact that it’s on the right side specifically doesn’t change the list of likely causes. Most of these conditions are “unilateral,” meaning they naturally strike one side at a time. Here’s how to narrow down what’s going on.
Cluster Headache
If the pain comes on fast, feels excruciating, and centers right around or behind your eye, cluster headache is a strong possibility. These are sometimes called “suicide headaches” because of their severity. Each attack lasts between 15 minutes and 3 hours, and they tend to repeat daily for weeks or months before disappearing entirely, sometimes for a year or longer.
What makes cluster headaches distinctive is a set of automatic body responses that happen on the same side as the pain. Your eye may water or turn red. Your nose gets congested or starts running on that side. The eyelid may droop or swell, and your forehead might flush or sweat. You’ll also likely feel restless or agitated during an attack, unable to sit still. People with cluster headaches often pace, rock, or press on their eye.
These headaches can strike between once every other day and up to eight times in a single day during an active cycle. They often hit at the same time each day, frequently waking people from sleep an hour or two after they drift off. Men are affected more often than women.
For acute relief, high-flow oxygen through a non-rebreather mask (at a rate of 7 to 15 liters per minute of pure oxygen) is one of the most effective options and can be set up for home use. Prescription medications delivered by injection or nasal spray also work quickly, often aborting an attack within minutes.
Migraine
Migraine is the most common reason people experience recurring pain behind one eye. The pain is typically moderate to severe, pulsing or throbbing, and it tends to worsen with physical activity. An episode lasts anywhere from 4 to 72 hours.
What distinguishes migraine from other headache types is the package of symptoms that comes with it: sensitivity to light and sound, nausea or vomiting, and sometimes visual disturbances (aura) like flickering lights, blind spots, or zigzag lines before the pain begins. You might also notice that smells bother you or that you feel unusually tired in the hours leading up to an attack.
Migraine can affect the same side repeatedly, so if your right eye is always the focal point, that’s a common pattern. Triggers vary widely between people but often include disrupted sleep, skipped meals, alcohol, hormonal shifts, weather changes, and stress (or the letdown after stress).
Tension Headache
Tension-type headache is the most common headache overall, and while it’s usually felt as a band of pressure around the entire head, it can sometimes concentrate behind one eye, especially when muscle tightness in the neck, temples, or jaw is worse on one side. The pain is typically mild to moderate, steady rather than throbbing, and doesn’t come with nausea or sensitivity to light.
Prolonged screen time, poor posture, clenching your jaw, and stress are the usual drivers. If you notice the pain builds through the workday and sits behind your right eye along with tightness in your neck or shoulder on that side, muscle tension is a likely contributor. A related condition, cervicogenic headache, starts from stiffness or dysfunction in the neck and refers pain to one side of the head, around the eye, and down into the shoulder and arm. Blurred vision and light sensitivity can accompany it.
Sinus-Related Pain
Sinus inflammation can produce a deep, pressure-like ache behind the eye, and the location of that pain depends on which sinus is affected. Your sphenoid sinuses sit deep inside your skull, behind the upper part of your nasal cavity, very close to your optic nerves. Infection or inflammation there can cause headaches and facial pain that feels like it originates behind the eye. Your ethmoid sinuses, located between your eyes, can also refer pain into or behind the eye socket. Frontal sinus pain typically centers in the forehead but can radiate behind the eyes as well.
Sinus headaches are dull, pressure-like, often worse in the morning after lying flat all night, and tend to last for days. They usually come alongside nasal congestion, discolored mucus, or a reduced sense of smell. If you don’t have those nasal symptoms, what feels like a sinus headache is more likely migraine, which is frequently misdiagnosed as sinusitis.
Bacterial infections of the sphenoid sinus deserve particular attention because these sinuses are so close to the brain and optic nerves. Untreated infections in that area can become serious.
Eye Conditions
Eyestrain from uncorrected vision problems or long hours of close-focus work (screens, reading) can cause aching behind one or both eyes. This type of pain is usually mild, comes on gradually, and improves when you rest your eyes.
A more urgent cause is acute angle-closure glaucoma, where pressure inside the eye spikes suddenly. Symptoms include severe eye pain, headache, nausea, blurred vision, and seeing rainbow-colored halos around lights. This is a medical emergency that can damage your vision permanently within hours. It’s uncommon, but if you’re experiencing sudden, severe eye pain with visual changes, it requires immediate evaluation.
Jaw and Dental Problems
Dysfunction in the temporomandibular joint (the hinge where your jaw meets your skull) can send pain upward into the temple and behind the eye on the same side. This is often linked to teeth grinding, jaw clenching, or habits like chewing gum excessively. The pain may be constant or throbbing and typically gets worse with jaw movement or when you press on the muscles around your jaw.
Dental infections, particularly abscesses, can also produce poorly localized facial pain and headache. If your behind-the-eye headache doesn’t fit any of the patterns above and you’ve had recent dental issues or jaw tension, this connection is worth exploring.
How Doctors Figure Out the Cause
Most headaches behind the eye are diagnosed based on your description of the pain: how long it lasts, how often it happens, what it feels like, and what other symptoms come with it. A detailed history is the single most useful diagnostic tool.
Imaging is not routine for typical headache patterns. Doctors order an MRI or CT scan when something in the picture is unusual. According to Johns Hopkins imaging guidelines, MRI is the preferred study for pain around or behind the eye, new headaches with neurological symptoms like vision changes or weakness, headaches in older adults, and suspected sinus complications. A CT scan is typically the first choice for sudden, severe “thunderclap” headaches or after head trauma. Specialized imaging of blood vessels may be ordered if a doctor suspects a tear in an artery in the neck.
If your headaches follow a recognizable pattern (migraine with light sensitivity, cluster headache with eye watering, tension headache that builds with stress), imaging often isn’t needed at all.
When the Pain Is an Emergency
Most headaches behind the eye, even painful ones, are not dangerous. But certain features signal something that needs immediate attention:
- Sudden, explosive onset: a headache that reaches maximum intensity within seconds, often described as “the worst headache of my life”
- New problems with speech, vision, movement, or balance that you haven’t experienced with headaches before
- High fever or stiff neck accompanying the headache
- Repeated vomiting with no other explanation
- Sudden vision loss or halos around lights with severe eye pain, which may point to acute glaucoma
Any of these combinations warrant a trip to the emergency room. A standard headache that you’ve had many times before, even if it’s severe, is a different situation from a brand-new headache with alarming features. The distinction matters.