Why do your ears hurt just before a plane lands?
― Getting air into the space behind your eardrum is much harder than letting it out
Your ears were fine on takeoff, but shortly before landing they start to throb. Many people notice this difference, and there's a clear reason for it: behind your eardrum sits a sealed pocket of air, and while it's easy to let air "out" of it, getting air back "in" is much harder.
The plane starts descending, and an announcement plays: "We will shortly begin our descent for landing." Around then, your ears feel blocked, and sounds seem to come from far away.
At its worst, it turns into a sharp pain, as if something deep in your ear is being squeezed. Nearby, a baby suddenly starts crying.
You swallow, and there's a little "pop" deep in your ear, and suddenly you feel relief. So what was actually happening inside your ear?
It comes down to just two reasons
Just behind your eardrum sits a small chamber filled with air. When only the outside pressure changes, the eardrum gets pushed and pulled by different forces from either side — and that's what hurts.
A narrow tube connects that chamber to your throat, but it's normally closed. This tube opens easily when letting air escape outward, but it's much harder to open when air needs to go in.
In other words, your ears hurt because when the plane "descends," air needs to be pushed back into your ear. Let's look at this step by step.
The eardrum is a thin membrane sandwiched between two pockets of air
At the end of your ear canal sits the eardrum, a thin membrane about 0.1mm thick. Behind it is a small cavity inside your ear. That cavity is filled with air, and the eardrum sits sandwiched between this air and the air outside.
Normally, the pressure is the same on both sides. So the eardrum isn't pushed by either side, and it's free to vibrate purely in response to sound.
But on a plane, the cabin pressure changes a great deal. When an airliner flies at high altitude, air is pumped into the cabin. Even so, the cabin pressure is said to drop to roughly the same level as at an altitude of about 2,000 metres. As the plane approaches landing, the pressure climbs back toward ground level.
At this point, if the outside pressure rises while the pressure behind the eardrum stays low, the eardrum gets pushed inward from outside. The thin membrane gets stretched, and that registers as pain. Sound also has a harder time getting through, so your ears feel blocked.
Letting air out is easy — getting it in is hard
The chamber behind the eardrum connects to the space at the back of the nose and throat via a narrow tube called the Eustachian tube. When this tube opens, the chamber's pressure equalizes with the outside.
But the Eustachian tube is normally closed, its soft walls stuck together. It opens only for a moment — when you swallow or yawn. Muscles in the throat pull on the tube's walls to create a gap.
Look at the left side of Figure 1. As the plane climbs, the outside pressure drops, and the chamber ends up with more air than the surroundings. That extra air then pushes the closed tube open from the inside. Air escapes outward on its own, so there's little pain.
The right side of Figure 1 shows descent. Now the chamber has too little air, and its pressure is lower than outside. The tube gets pressed from outside, and its walls stick together even more firmly. The only way to get air in is to force the tube open using muscle power.
While the pressure difference is still small, simply swallowing is enough to open it. But once the difference grows too large, swallowing alone reportedly can't open the tube anymore. Pain builds sharply just before landing because the difference keeps accumulating little by little.
The "pop" or "click" you hear when swallowing is the sound of the Eustachian tube opening, air rushing in, and the pushed-in eardrum springing back to its normal position. The same thing happens when a bullet train enters a tunnel, or when an elevator rushes up or down a tall building.
A child's Eustachian tube is shorter than an adult's, lies more horizontally, and its opening-and-closing mechanism is still immature. Babies can't clear their own ears. Once the descent begins, having them nurse, bottle-feed, or drink so they swallow repeatedly is said to help.
So what should you actually do?
- Swallow often once descent beginsSip water little by little, suck a sweet, chew gum, or yawn. The trick is to open the tube repeatedly while the pressure gap is still small.
- Don't sleep before landingIf you're asleep, you swallow less often, and the pressure gap builds up.
- Clear your ears "gently"Pinch your nose, close your mouth, and blow gently into your nose. Straining too hard can actually damage your ears.
When your nose is blocked by a cold or hay fever, the opening of the Eustachian tube is also swollen and harder to open. If you have a flight planned, it's worth checking with an ear, nose and throat doctor beforehand. And if pain or muffled hearing continues after landing, see a doctor promptly.
Summary
Behind your eardrum sits a small, sealed pocket of air. When a plane climbs, air escapes from this pocket through the tube on its own. When it descends, you have to force the closed tube open to let air in. Your ears only hurt before landing because of this one-way trait: easy to let air out, hard to let it in.
Air behind your eardrum leaves on its own,
but to get back in, it needs your "gulp."
For how pressure differences affect the body, see "Why does altitude sickness happen just from gaining elevation?"; for the surprising strength of invisible air pressure, see "Why can you drink through a straw?"
- In a quiet room, focus on your ears and swallow slowly. Listen for a small "click" deep in your ear.
- Now try a big yawn. Compare the sound and sensation with when you swallowed.
- In a tall building's elevator, or driving down a mountain road, notice when the blocked feeling starts and count how many swallows it takes to clear.
Don't try pinching your nose and blowing hard as an experiment. Also avoid trying this when your ears hurt or when you have a cold.
Want to go deeper? ― Terms, formulas, and how this connects to textbooksWe label each section by level, from middle-school science to university-level specialist courses
- MSCovered in middle-school science
- HSCovered in high-school "Physics" or "Biology"
- HS+Advanced high-school content, or textbook sidebar material
- UnivNot taught in high school — university-level specialist content (otolaryngology, physiology)
- ResearchNot yet settled even at university level — an area researchers are actively investigating
MSTerms: this phenomenon has proper names
- Middle ear: the air-filled cavity behind the eardrum. It houses the tiny bones (ossicles) that transmit sound.
- Eustachian tube: the tube connecting the middle ear to the upper throat behind the nose (nasopharynx). Normally closed, it opens briefly when you swallow or yawn.
- Barotitis media (airplane ear): a condition where cabin pressure changes can't be equalized with the middle ear, damaging the eardrum or middle-ear lining. It's a type of barotrauma.
MSHSWorking it out: is the pressure gap before landing like diving how many metres into a pool?
Let's convert the cabin pressure change into an equivalent depth of water. Symbol meanings and units are summarized right after the table.
| Ground-level pressure (standard) | about 1013 hPa |
| Cabin pressure at high cruising altitude (rough lower bound) | said to be about 750 hPa |
| Pressure increase per metre of water depth | about 98 hPa |
| Eardrum surface area | said to be about 0.6 cm² (0.00006 m²) |
| Gap at which swallowing reportedly can't open the Eustachian tube | about 90 mmHg |
| Pressure gap restored by the time of landing | 1013 − 750 = 263 hPa |
| Converted to water depth | 263 ÷ 98 ≒ 2.7 m |
| Converting the tube-closing gap to hPa (1 mmHg ≒ 1.333 hPa) | 90 × 1.333 ≒ 120 hPa |
| Converting that gap to water depth | 120 ÷ 98 ≒ 1.2 m |
| Converting 120 hPa to Pa | 120 × 100 = 12000 Pa |
| Force on the eardrum (pressure × area) | 12000 × 0.00006 = 0.72 N |
| Converted to a weight (0.72 N ÷ 9.8) | 0.72 ÷ 9.8 ≒ 0.073 kg |
The pressure change your ears experience as the plane descends is roughly like diving about 2.7m to the bottom of a pool. If you go without swallowing until a gap equivalent to about 1.2m of depth builds up, the Eustachian tube reportedly becomes hard to open. At that point, the eardrum carries the equivalent of about 70-odd grams pressing on an area the size of your little fingertip.
| Symbol | Meaning and unit |
| hPa | Hectopascal. A unit of pressure, where 1 hPa = 100 Pa |
| mmHg | Millimetres of mercury. A pressure unit commonly used in medicine |
| N | Newton. A unit of force; the weight of about 0.1 kg is roughly 1 N |
HSHS+Why is it "one-way"?
HSThe middle ear is a cavity enclosed by bone, so its shape barely changes. When only the outside pressure changes, the eardrum is the only part that can move. So the pressure difference converts almost directly into a force pushing the eardrum. Thinking in terms of Boyle's law, the middle ear's volume barely changes, so its pressure can hardly keep pace either.
HS+The throat-side portion of the Eustachian tube is made of cartilage and soft tissue rather than bone. When middle-ear pressure is high, it's pushed from inside and the walls peel apart to open. When middle-ear pressure is low, the walls are pressed together from outside, creating a valve-like force that closes it. That's why air escapes passively on ascent, but needs active muscle effort to let air in on descent.
UnivThe muscle that opens the Eustachian tube, and how middle-ear air gradually depletes
The main job of opening the Eustachian tube is thought to belong to the tensor veli palatini, a muscle deep in the throat. During swallowing or yawning, this muscle pulls the tube's walls sideways to create a gap. The middle-ear lining also gradually absorbs the gases in the air inside into the bloodstream. So even without flying, if the Eustachian tube never opens, the middle ear slowly develops negative pressure. This is why reduced Eustachian tube function from rhinitis and similar conditions can lead to otitis media with effusion. In medicine, a test that measures how freely the eardrum moves (tympanometry) is used to check middle-ear pressure.
ResearchWhat's still not fully understood
- The fine mechanics of how the Eustachian tube opens. Which muscles act in what order, and which part of the tube opens first, are hard to capture directly with imaging and are still being studied.
- Individual differences in ear sensitivity to pain. Even on the same flight, some people hurt and others don't. How much each factor — tube shape, mucosal condition, muscle function — contributes isn't yet fully known.
- How to compare the effectiveness of prevention methods. Nasal medications, ear-clearing devices, and pressure-regulating earplugs are all in use, but studies disagree on how well each works for whom.
In short, this article too reflects "what's understood so far." Individual differences in how pain is felt are especially large.
How this maps to textbooks (by level)
| Level | Subject/Unit | Where in this article |
|---|---|---|
| MS | Science (atmospheric and water pressure, ear structure) | How the eardrum sits between two air pockets; conversion to water depth |
| HS | Physics (pressure, gas laws), Biology (receptors) | Force from pressure × area; a cavity with fixed shape |
| HS+ | Advanced physics (soft tubes and valves) | Why the Eustachian tube is one-way |
| Univ | Otolaryngology, physiology | Tensor veli palatini, middle-ear gas exchange, otitis media |
| Research | Research on Eustachian tube function | Fine details of opening mechanics, individual differences, evaluating prevention methods |
| ― | Everyday connections | Ear discomfort on planes, bullet trains, elevators, mountain roads |
- US Federal Aviation Administration (FAA), pilot safety brochure "Ear Facts"
- Mayo Clinic, "Airplane ear"
- Ichiro Kirikae (original author), Shin Jibi Inkōka Gaku (New Otolaryngology), Nanzando (森林総合研究所) — anatomy and physiology of the middle ear and Eustachian tube. Publisher: 南山堂 (Nanzando)
- Otological Society of Japan (日本耳科学会) and the Japan Oto-Rhino-Laryngological Society, Head and Neck Surgery (日本耳鼻咽喉科頭頸部外科学会) — clinical guidance on Eustachian tube function
※This article is a general-audience science explainer. The figures given are approximate, meant to help you understand the mechanism. If ear pain or muffled hearing continues, or if fluid leaks from your ear, don't self-diagnose — see an ear, nose and throat doctor. Follow any instructions from your airline or doctor if given.