The train is packed, and you have just done the math nobody else in the car is doing. Four stops to go. Every seat is taken. The nearest pole is a lean and a half away. Your vision has started to prickle at the edges, and a quiet, practical voice in your head is asking whether you'd rather faint here or get off one stop early and sit on a curb.

Nobody around you knows this is happening. To them you are a person looking at their phone. That gap, between how a commute looks from outside and what it asks of an upright body with unreliable blood-pressure control, is the whole story of POTS and public transportation.

Why a commute is a stack of triggers, not one

A bus or train ride is rarely hard for just one reason. It stacks several things that postural orthostatic tachycardia syndrome is sensitive to, and each one alone might be manageable.

Standing, and especially standing still. When you stand, gravity pulls roughly a pint of blood or more into the veins of the legs and abdomen. In most people the autonomic nervous system tightens those vessels within seconds. In POTS that response is inconsistent, so less blood returns to the heart, and the heart speeds up to compensate. A platform wait or a crowded aisle is a long, motionless version of exactly that test. Walking helps because calf muscles squeeze the veins and push blood back up. Standing in a packed car denies you that pump.

Heat. Warm air makes the vessels in your skin widen to shed heat, which gives even more room for blood to pool. Crowded vehicles, stuffy stations, and sun on bus windows add up quickly. Heat is one of the most commonly reported POTS triggers, and a vehicle full of bodies is a small heat engine.

Motion you can't predict. Starts, stops, and curves force constant small postural adjustments. In a seat you barely notice them. On your feet, they are repeated demands on a system already working hard to hold your pressure steady, and bracing against them uses muscle effort that can raise your heart rate further.

The morning or the long day. Many people with POTS are at their worst early, after a night of lower blood volume, or late, after a day of spending reserves. Commutes tend to land at precisely those two times.

Not being able to leave. Between stations you can't lie down, can't step outside, and can't easily ask for help. The trapped feeling matters physically too. Anxiety about fainting releases adrenaline, which pushes the heart rate higher, which makes the symptoms louder. That loop is real, and it isn't weakness. It is physiology doing what it does.

The decision that matters most is made before you leave

The most useful reframing is that the ride begins at home. Your goal is to arrive at the stop with as much blood volume and as little accumulated strain as possible.

  • Front-load fluid and salt as your clinician has advised. Many people with POTS are told to increase fluids and sodium. Drinking a large glass of water about 15 to 30 minutes before leaving gives a temporary pressure lift for some people, but do it only if your care team has not restricted your intake.
  • Eat something small. A heavy meal pulls blood toward the gut, and a long fast can leave you low. A light, salty snack is easier to carry into a commute than a big breakfast.
  • Wear your compression. Waist-high compression or an abdominal binder, if you have been advised to use one, works on the large veins where most pooling happens. Calf-high socks alone do less.
  • Build in slack. Rushing to catch a vehicle is a heart-rate spike on its own. Leaving ten minutes earlier turns a sprint into a walk.

At the stop: the waiting is the hard part

Platforms and bus stops are where people with POTS often get hit hardest, because you stand still on purpose, sometimes for twenty minutes.

If there is a bench, take it, and let the vehicle come to you rather than hovering at the edge. If there is no bench, you can lean against a wall or a pillar, which takes work off your legs, or sit on your bag or the ground if you feel unsteady. Looking odd for a few minutes costs less than a fall.

If you have to stand, keep your legs doing something. Shift your weight, tense and release your thigh and calf muscles, or rock gently heel to toe. These small contractions replace some of the walking pump you are missing.

On board: how to stay upright and stay conscious

Seats are the goal, and it is reasonable to claim one. Many transit systems have priority seating, and some regions have discreet cards, lanyards, or badges for people with non-visible disabilities. Check whether your local agency offers one. You can also simply say, "I have a medical condition and need to sit." You don't owe anyone a diagnosis.

If you must stand:

  • Face the direction of travel and hold something solid. Gripping a pole also lets you use your arms for counterpressure, which some people find steadying.
  • Cross your legs and squeeze. Standing with legs crossed and thigh muscles clenched is one of the simplest counterpressure maneuvers. It compresses the leg veins and can raise blood pressure briefly. Switch legs when you tire.
  • Clench your fists and tense your buttocks and abdomen. Isometric contractions push blood back toward the chest.
  • Don't lock your knees. Locked knees reduce the muscle activity that keeps blood moving.
  • Watch for your early signals. Greying vision, a sudden wash of heat, a thudding chest, or ringing in the ears are your cue to sit down immediately, on the floor if necessary. Sitting or crouching early is far safer than waiting for certainty.

If you do sit, you can add to the effect by pressing your feet flat and tightening your leg muscles from time to time. Sitting with your legs raised, such as on a rail or your bag, is a bonus when the space allows.

Getting off is its own risk

The moment you stand from a seat to exit, you get the same orthostatic drop you get from getting out of bed, only now you are on a moving or crowded vehicle with a deadline. Stand up one stop earlier than you strictly need to, hold the rail, pause for a few breaths, and then move. On stairs and escalators, use the handrail and take them slowly.

Your next moves

  • Run a trial commute on a good day. Ride your route at an off-peak time, note where there are seats, benches, and cooler spots, and learn which stops have lifts or elevators.
  • Identify one "escape stop" every few stations. Know where you could get off and sit if you feel a wave coming, so the decision is already made when you need it.
  • Ask your transit agency about a priority seating or non-visible disability pass. Many have a form on their website. A card means you don't have to explain yourself in a crowded car.
  • Pack a commute kit. Water, a salty snack, a small folding fan or cooling cloth, and a written line on your phone: "I have POTS. If I faint, I need to lie flat with my legs raised." Keep it where you can reach it.
  • Write down your times, not just your symptoms. Note which departures you handle well and which flatten you. If the 8:10 is a disaster and the 8:40 is fine, you've found a lever worth pulling, and it's evidence for a conversation about flexible work hours.

Why the pattern matters more than any single ride

The hard part of commuting with POTS is that every ride feels like a verdict on your body. Some days you glide through and others you're white-knuckled by the second stop, and it's tempting to conclude that the bad days mean you're failing. Mostly they mean your hydration, sleep, heat, and timing lined up differently.

That's where tracking helps. Stable, a POTS tracker, is built for noticing these patterns, so a log of your heart rate, symptoms, and daily conditions can show you which routes, hours, and preparations actually work for you, rather than leaving you to guess from memory on a rough morning. If a commute is quietly shaping the edges of your life, you can try it at https://stable.lumenlabs.works.