Several types of pressure can cause headaches, ranging from drops in atmospheric pressure before a storm to dangerously high blood pressure to something as simple as a tight hat. The word “pressure” applies to surprisingly different mechanisms, and understanding which one is behind your headache changes what you can do about it.
Barometric Pressure and Weather Headaches
Falling atmospheric pressure is one of the most common environmental headache triggers. Standard atmospheric pressure sits around 1013 hectopascals (hPa). A study published in SpringerPlus found that migraine attacks were triggered most frequently when pressure dropped by just 6 to 10 hPa below that standard, landing in the 1003 to 1007 hPa range. That’s a modest dip, roughly equivalent to the pressure change that occurs when a weather front moves through.
The biological explanation involves the trigeminal nerve, which is the main nerve responsible for sensation in your face and head. Research in rats showed that neurons receiving input from the eye became significantly more active when barometric pressure dropped. The trigeminal nerve also supplies your sinuses, teeth, and jaw, which helps explain why weather-related headaches can feel like they radiate across your entire face. You don’t need a dramatic storm to feel this. A slow, steady pressure drop over several hours is enough to set off an attack in susceptible people.
Airplane Headaches During Descent
Cabin pressure changes during flights follow the same principle as weather shifts, but compressed into a much shorter window. Cabin pressure decreases by about 8 hPa for every 300 meters a plane climbs. When the plane descends, that pressure reverses rapidly, and the air trapped in your sinuses and middle ear can’t equalize fast enough. This creates localized inflammation and pain.
Landing is the worst phase. In a systematic review of 275 patients with airplane headaches, 210 experienced attacks during descent, compared to only 33 during ascent. The pain is typically intense, one-sided, and centered around the forehead or behind one eye. It usually resolves within 30 minutes of landing. People with nasal congestion or sinus issues before boarding are more vulnerable because their sinus passages are already partially blocked, making equalization harder.
Sinus Pressure vs. Migraine
Most headaches that people describe as “sinus pressure” are actually migraines. This is one of the most common misidentifications in headache medicine. The nerves activated during a migraine are the same nerves that supply the sinuses, eyes, ears, and teeth. When those nerves fire, they can cause nasal congestion, a runny nose, and watery eyes, symptoms that feel identical to a sinus infection.
A true sinus headache, called rhinosinusitis, requires an actual viral or bacterial infection. The hallmarks are thick, discolored nasal discharge, reduced sense of smell, pressure behind the cheekbones and around the eyes, aching in the upper teeth, and often a fever. Sinus headache pain should resolve within seven days after the infection clears. If your “sinus headaches” come and go without those infection symptoms, or if they include throbbing pain that worsens with movement, sensitivity to light, or nausea, you’re likely dealing with migraine.
High Blood Pressure Headaches
Everyday high blood pressure rarely causes headaches on its own. The threshold is much higher than most people expect. Headaches attributed to hypertension typically occur only during a hypertensive crisis, when blood pressure reaches 180/120 mmHg or higher. At that level, the excessive force of blood flow can cause swelling in the brain, producing a severe, often pounding headache.
A reading of 180/120 is a medical emergency regardless of whether you have a headache. If you’re checking your blood pressure at home and see numbers in that range alongside a headache, that combination warrants a call to emergency services. Readings in the more common elevated range (say, 140/90 to 160/100) are a health concern over time but are not what’s causing your headache today.
High Pressure Inside the Skull
Your brain floats in cerebrospinal fluid (CSF), and the pressure of that fluid matters. When internal head pressure rises above normal, a condition called idiopathic intracranial hypertension (IIH), headaches are one of the primary symptoms. Diagnosis involves measuring CSF pressure during a spinal tap. A reading above 250 mm of water is one of the key diagnostic criteria, though some people develop symptoms at lower pressures if their optic nerves are particularly sensitive.
IIH headaches tend to be daily, diffuse, and worse in the morning. They can be accompanied by visual disturbances like brief episodes of dimming or blurring, pulsing sounds in the ears that sync with your heartbeat, and pain behind the eyes. This condition is most common in women of childbearing age and is strongly associated with higher body weight. It’s distinct from a typical tension headache or migraine because the pressure is measurably elevated and, left untreated, can threaten vision.
Low Pressure Inside the Skull
Pressure that’s too low causes headaches just as readily as pressure that’s too high. Spontaneous intracranial hypotension occurs when cerebrospinal fluid leaks out through a tear in the membrane surrounding the spinal cord, reducing the cushion of fluid around the brain. The defining feature is a headache that dramatically improves within minutes of lying down and worsens when you stand up.
This positional pattern exists because gravity pulls the brain downward when you’re upright, and with less fluid to support it, the brain tugs on the pain-sensitive membranes surrounding it. The headache can also flare with coughing, sneezing, or moving your head quickly, anything that shifts the brain’s position. In cases where the leak is on one side, lying on that specific side may be the only position that relieves the pain. These headaches are sometimes mistaken for migraines because they can be severe and debilitating, but the strict relationship to posture is the giveaway.
External Compression Headaches
Sometimes the pressure is purely mechanical. A tight helmet, swim goggles, a headband, or even a ponytail can compress the soft tissues of your scalp and forehead enough to trigger a headache. The International Headache Society classifies this as an external compression headache, and the diagnostic criteria are straightforward: the headache develops within one hour of sustained compression and resolves within one hour after the source is removed.
This type of headache is common among cyclists, construction workers, military personnel, and competitive swimmers. The pain is usually mild to moderate and localized to the area being compressed. It doesn’t involve nausea, light sensitivity, or the other features of migraine. If you notice headaches consistently tied to wearing specific gear, the fix is adjusting the fit or switching equipment rather than reaching for pain medication.