Pressure behind the eyes is most often caused by sinus congestion, tension headaches, or migraines. Less commonly, it can signal an eye condition like glaucoma or an autoimmune issue like thyroid eye disease. The sensation rarely originates from the eyeball itself. Instead, it’s usually referred pain from surrounding structures: inflamed sinuses, tight muscles, or swollen tissue in the eye socket.
Sinus Congestion and Infection
The sinuses are air-filled cavities that sit directly above, below, and behind your eyes. When they become inflamed or blocked with mucus, the resulting pressure radiates into the eye area. One type in particular, sphenoid sinusitis, is strongly linked to a deep ache behind the eyes because the sphenoid sinus sits right behind the eye sockets, close to the optic nerve and several other critical structures.
The anatomy explains why sinus problems so reliably affect the eyes. The bone separating your sinuses from your eye socket (called the lamina papyracea) is paper-thin and sometimes has natural gaps. Even when intact, veins run between the sinus lining and the tissue around your eyes without any valves to stop the flow. This means inflammation and swelling in the sinuses can easily spread pressure into the eye socket, a rigid compartment with almost no room to absorb it. The result is that dull, heavy feeling behind your eyes that worsens when you bend forward.
You’ll usually know it’s sinus-related if you also have nasal congestion, thick mucus, facial tenderness, or a reduced sense of smell. Keeping your nasal passages moist is one of the most effective ways to get relief. Steroid nasal sprays (available over the counter) reduce swelling inside the nasal passages, and decongestants in pill or spray form can help open things up. Stick to oral decongestants for no longer than a week at a time. Over-the-counter pain relievers like ibuprofen or acetaminophen can take the edge off the pain while you address the underlying congestion.
Tension Headaches
Tension headaches produce a dull, non-throbbing pain that often wraps around both sides of the head and extends behind the eyes. They’re associated with tightness in the scalp and neck muscles, and unlike migraines, the pain stays at a relatively constant level rather than pulsing. They don’t typically cause nausea or sensitivity to light. Many people describe the sensation as a band squeezing their head, with pressure settling behind the eyes or across the forehead.
Stress, poor posture, screen time, and lack of sleep are the most common triggers. If you notice the pressure building after hours at a desk or during a stressful week, a tension headache is the likely culprit.
Migraines
Migraines frequently cause a feeling of pressure or pain behind the eyes, but they differ from tension headaches in several ways. Migraine pain is moderate to severe, typically one-sided, and throbbing. It gets worse with physical activity and commonly comes with nausea, light sensitivity, and sound sensitivity. Attacks last anywhere from 4 to 72 hours.
If your eye pressure comes with these additional symptoms, especially if it’s concentrated on one side of your head, you’re more likely dealing with a migraine than simple tension or sinus congestion. People sometimes confuse the two because sinus congestion and migraines can both cause facial pressure, but migraines won’t produce thick nasal discharge or fever.
Thyroid Eye Disease (Graves’ Disease)
An overactive thyroid gland can trigger an immune response that causes the fat, muscles, and connective tissue behind your eyes to swell. These tissues absorb water and expand, pushing the eyeball forward in its socket. Because the eye socket is a rigid bony compartment, there’s nowhere for that extra volume to go except outward. This creates persistent pressure behind the eyes and, in more advanced cases, visibly bulging eyes.
The swelling happens because immune cells activate specialized cells behind the eye that produce large amounts of a water-absorbing substance, expanding the orbital tissue. Fat cells also multiply. The combination compresses the muscles that move your eyes and can even press on the optic nerve. If you notice eye pressure along with bulging eyes, double vision, difficulty moving your eyes, or if you already have a thyroid condition, this is worth investigating with your doctor.
Optic Neuritis
Optic neuritis is inflammation of the optic nerve, the cable that carries visual information from your eye to your brain. The hallmark symptom is pain that gets worse when you move your eyes, often described as a dull ache behind the eye. Vision loss or blurriness in one eye typically develops alongside the pain over hours to days.
This condition is sometimes an early sign of multiple sclerosis, though it can occur on its own. If your behind-the-eye pressure specifically worsens when you look up or move your eyes side to side, and your vision seems off in one eye, optic neuritis is a possibility that warrants prompt evaluation.
Glaucoma and Elevated Eye Pressure
Your eyes maintain an internal fluid pressure that normally falls between about 9 and 18 mmHg, with anything above 21 mmHg considered elevated. Most forms of glaucoma develop slowly and painlessly, so the common open-angle type won’t cause noticeable pressure sensations. But acute angle-closure glaucoma is a different story entirely.
In an acute angle-closure attack, the eye’s drainage system suddenly blocks and pressure can spike to 50 to 80 mmHg. This is an emergency. Symptoms come on fast: severe eye pain (reported by 83% of patients), blurred or reduced vision (86%), a red eye (75%), nausea or vomiting (44%), headache (34%), and halos around lights. The affected pupil is typically fixed and doesn’t respond to light normally.
If you experience sudden, severe eye pain with vision changes, nausea, and a red eye, get to an eye doctor or emergency room immediately. High pressure at these levels can damage the optic nerve and cause permanent vision loss quickly.
Other Causes Worth Knowing
A toothache, particularly in the upper teeth, can refer pain upward into the eye area because the roots of the upper molars sit close to the floor of the maxillary sinus. Facial injuries can also cause swelling and pressure that radiates behind the eyes, even if the impact didn’t directly involve the eye area.
Prolonged screen use is another common trigger. Staring at a screen reduces your blink rate, dries out your eyes, and keeps the muscles around your eyes in sustained contraction. The resulting strain often feels like pressure behind the eyes, especially toward the end of the day.
How Eye Pressure Is Measured
If you visit an eye doctor, they’ll likely perform tonometry, a quick test that measures the fluid pressure inside your eye. The most accurate version uses a small disc-shaped device that gently touches the surface of your eye (after numbing drops) and measures how much force it takes to slightly flatten the cornea. It uses the same unit as blood pressure: millimeters of mercury. The test takes seconds and is painless. For ongoing monitoring, some patients wear a sensor on the eye like a contact lens that tracks pressure changes over time.
Tonometry screens for glaucoma but won’t identify sinus problems, migraines, or muscle tension as the source. If your eye pressure readings come back normal and the sensation persists, your doctor will look at those other causes.