The cable car takes you from the Teide car park to 3,555 metres in about eight minutes, and most people are at sea level with a coffee an hour before that — which is a faster ascent than any mountaineer would ever choose, and the reason a lot of visitors feel briefly awful at the top. It is rarely serious. It is very common, it is entirely predictable, and a few simple decisions turn a wobbly hour into one of the best mornings of the holiday.
Here is the geography in plain terms. Teide's summit stands at 3,715 metres, the highest point in Spain and the third-tallest volcano on earth measured from its base on the ocean floor. The road brings you across the caldera floor at roughly 2,100 to 2,350 metres. The lower cable car station sits at about 2,356 metres and the upper station, La Rambleta, at about 3,555 — leaving a last 160 metres of ascent on foot to the crater rim, for which you need a free permit.
At 3,555 metres the air holds roughly a third less oxygen than at the beach. Your body notices. It copes perfectly well, but it does so by breathing faster and working your heart harder, and while it adjusts you may feel breathless, light-headed or headachy. That is normal. The practical guidance on visiting — tickets, opening times, the queue — sits on our main page about Teide and the cable car; this page is about your body.
What mild altitude sickness actually feels like
Acute mountain sickness becomes possible above roughly 2,500 metres, so the caldera road itself is already in the zone and the upper station is well into it. The usual symptoms are:
- A dull, band-like headache, often frontal
- Breathlessness on the mildest exertion — walking up the ramp from the cable car feels absurdly hard
- Light-headedness or a floaty, slightly drunk feeling
- Nausea or complete loss of appetite
- Tiredness out of all proportion to what you have done
- Tingling fingers, and for some people a very fast heart rate at rest
You will see people sitting on the rocks at La Rambleta looking grey. Almost all of them are fine within twenty minutes of going back down, because descent is the cure for altitude sickness and here the descent takes eight minutes and costs nothing extra. If someone in your group feels genuinely unwell, do not talk them into staying for the view. Put them on the next car down.
Warning signs that are not ordinary altitude grumbles: confusion, an inability to walk in a straight line, a persistent cough, breathlessness that does not ease when you sit still, or chest pain. Descend immediately and get help — the station staff are used to this, and 112 is the emergency number across the islands.
Who should think twice, and who should not go at all
The cable car operator posts health advice at the ticket desk, and it deserves reading rather than walking past. The groups who should take proper medical advice before going up are:
- Anyone with significant heart disease — angina, a recent heart attack, uncontrolled arrhythmia, heart failure. Thin air asks your heart to do more work, not less.
- Anyone with serious lung disease — COPD, severe asthma, pulmonary hypertension. If you use oxygen at home, this trip is not for you.
- People with severe anaemia or sickle cell disease or trait, where low oxygen can trigger a crisis.
- Anyone recently discharged from hospital, or recovering from a chest infection.
- Pregnant travellers, who are usually advised to avoid sustained exposure much above 2,500 metres; the wider picture is on our page about holidaying here while pregnant.
Small children tolerate the altitude reasonably well but cannot tell you what they are feeling, and a toddler who has gone quiet and floppy at 3,500 metres should go down. Older visitors are not automatically at risk — fitness and existing conditions matter far more than age, a point our guide for older travellers in the Canaries returns to. If you are on medication and unsure, ask at a Canarian pharmacy the day before; they will give you a straight answer.
If you have been diving, wait
This is the one that catches people, because the islands are excellent for diving and Teide is on everyone's list, so the two end up in the same week. After a dive your tissues hold dissolved nitrogen. Going to altitude lowers the ambient pressure just as a flight does, and can bring that nitrogen out of solution — decompression sickness, at the top of a volcano, a long way from a chamber.
The commonly taught surface intervals before flying are a minimum of around 12 hours after a single no-decompression dive and at least 18 hours after repetitive or multi-day diving, following guidance from DAN and the main training agencies. Ascending to 3,555 metres is the same kind of exposure. Plenty of Canarian dive centres therefore tell customers to leave a full 24 hours between their last dive and the Teide cable car, and that is the number to work to unless your own operator tells you otherwise. Ask them directly — they will know, and they will not mind being asked.
The simple fix is scheduling: do Teide early in the trip and the diving later, or keep the dives and the volcano at opposite ends of the week.
Drink, and eat something
The air up there is not just thin, it is extraordinarily dry — the caldera is one of the driest places in Europe, which is exactly why the astronomers built there. You lose water through your breath at a rate you cannot feel, and dehydration produces a headache almost identical to mild altitude sickness. Most people who say "the altitude got me" were simply short of a litre of water.
Take more water than you think you need, drink it steadily from the moment you leave the coast rather than when you arrive, and eat a proper breakfast. Skip the beer at the roadside restaurant on the way up; alcohol at altitude hits harder and dehydrates you further. Caffeine is fine.
Break the ascent. The drive up from the south passes through Vilaflor at around 1,400 metres — stop for half an hour, walk about, drink something. An hour spent between 1,400 and 2,200 metres before you get in the cable car makes a measurable difference to how you feel at the top, and the pine forest is lovely anyway.
The trick almost nobody uses: sleep at 3,260 metres
Halfway up the mountain, on the Montaña Blanca walking route, stands the Refugio de Altavista at about 3,260 metres. It is a basic mountain hut with bunks, run in connection with the national park, and you book it in advance. Walkers use it to reach the summit for sunrise, before the cable car starts running.
What it also does, and what almost no day visitor gets, is give your body a night at altitude to adapt. Overnight acclimatisation is the thing serious mountaineers do and the thing the cable car makes it possible to skip. If you are set on standing on the actual summit and you are worried about how you will cope, the refuge is the answer — and you get the mountain's shadow stretching a hundred kilometres across the Atlantic at dawn, which the cable car crowd never sees. It is a real walk with a real ascent, so treat it as a mountain day; our page on walking on Tenerife sets out what that involves.
Cold, sun and sulphur
Altitude is not the only thing the summit throws at you. Temperature falls by roughly six or seven degrees for every thousand metres of ascent, so a pleasant 24 on the coast is single figures at the top, and the wind makes it feel colder still. There is snow up there for weeks most winters, and the road closes when it falls. People arrive in shorts and flip-flops every single day and stand shivering for four minutes before going back down; a fleece and long trousers cost nothing to carry, and our packing list for the islands assumes you will want them.
Ultraviolet radiation also rises with altitude — roughly ten per cent more for every thousand metres — and it bounces off any snow. Sunburn at 3,500 metres in cold air is one of the classic Canarian holiday injuries, and our page on sun safety here explains why the cool breeze is so misleading.
Finally, the crater is alive. Warm ground and fumaroles vent sulphurous gas near the rim, and on a still day the smell is unmistakable. It is harmless in passing but it can irritate an asthmatic chest, which is one more reason to have an inhaler in your pocket rather than in the car.
The summit permit, briefly
To go the last stretch from La Rambleta to the true summit at 3,715 metres you need a free permit issued by the national park, booked in advance and often gone weeks ahead in high season. It is a separate piece of admin from the cable car ticket, and it is covered in full on the main Teide page rather than repeated here. Worth knowing for this page: the permit walk is short but steep, at the altitude where you are least able to do steep, and it is the section where unprepared visitors most often turn back.
Making it a good day
Go up early, before the afternoon cloud rises against the caldera wall. Drink through the morning. Stop on the way up. Wear more clothes than the coast demands. Move slowly at the top, which is also the right speed for looking at the view. And accept that if you feel rough, the answer is a short ride down rather than a ruined afternoon.
The reward is genuinely rare: a viewing platform above most of the weather, with La Gomera, La Palma and El Hierro floating on the cloud to the west. If the altitude is a real worry, the same high-island light is available with far less ascent at Pico de las Nieves on Gran Canaria, which is also superb for night skies. But there is only one Teide, and most people manage it perfectly well.