POTS, short for postural orthostatic tachycardia syndrome, is a disorder of the autonomic nervous system that causes your heart rate to spike abnormally when you stand up. The defining feature: a sustained heart rate increase of at least 30 beats per minute (or 40 beats per minute in teenagers) within 10 minutes of moving to an upright position. POTS affects an estimated 3 to 6 million Americans, and despite how common it is, many people go years before getting a correct diagnosis.
What Happens in Your Body
Your autonomic nervous system controls things you don’t consciously think about: heart rate, blood pressure, sweating, digestion, and body temperature. Normally, when you stand up, your body automatically tightens blood vessels in your legs and slightly increases your heart rate to keep blood flowing to your brain. In POTS, that process malfunctions. Blood pools in the lower body, and the heart compensates by beating much faster than it should.
This isn’t just a fast heartbeat. The rapid heart rate is the body’s attempt to solve a deeper problem, and the underlying cause varies from person to person. Researchers have identified several distinct mechanisms that can produce POTS:
- Neuropathic POTS: Damage to small nerve fibers in the legs prevents blood vessels from tightening properly when you stand. Blood pools in the lower limbs, and the heart races to compensate. This subtype often follows viral infections and is associated with reduced sweating in the feet.
- Hyperadrenergic POTS: The body produces excessive levels of stress hormones, particularly norepinephrine. Between 30% and 60% of POTS patients show signs of this heightened “fight or flight” response, which can cause blood pressure swings, excessive sweating, and anxiety on top of the rapid heart rate.
- Low blood volume: Some people with POTS don’t retain enough fluid, leaving them with a chronically low blood volume. When they stand, there simply isn’t enough blood to circulate effectively.
- Physical deconditioning: Prolonged inactivity, whether from illness, chronic pain, or bed rest, can shrink the heart muscle and reduce cardiovascular fitness, making the body less able to handle the demands of standing.
Many people have overlapping mechanisms rather than fitting neatly into one category.
Symptoms Beyond a Racing Heart
The heart rate spike is what defines POTS on paper, but the symptom list stretches far beyond the cardiovascular system. Lightheadedness and feeling faint when standing are the most recognizable complaints. Many people also experience severe fatigue that doesn’t improve with rest, brain fog that makes concentrating or remembering things difficult, and headaches that can be debilitating.
Digestive problems are surprisingly common: nausea, vomiting, and constipation. Blurred vision, shakiness, excessive sweating, shortness of breath, and trouble sleeping round out a syndrome that can affect nearly every part of daily life. Symptoms typically worsen in warm environments, like hot showers, heated rooms, or summer weather, because heat causes blood vessels to dilate further, compounding the pooling problem.
The severity ranges widely. Some people notice mild lightheadedness that’s mostly an inconvenience. Others are unable to stand long enough to cook a meal, hold a job, or attend school.
Who Gets POTS and Why
POTS overwhelmingly affects women. Roughly 80% to 85% of diagnosed patients are female, most commonly women of childbearing age. The condition occurs worldwide, though precise numbers outside the United States are limited.
Viral infections are one of the most common triggers. Epstein-Barr virus (the cause of mono), influenza, and gastrointestinal infections have all been linked to POTS onset. COVID-19 brought significant attention to the condition: estimates suggest that 2% to 14% of COVID survivors develop POTS, and a much larger percentage experience POTS-like symptoms such as tachycardia and exercise intolerance within six to eight months of infection. A global survey of over 3,700 COVID survivors found that 30% of those who developed chronic tachycardia after infection reported a heart rate increase of more than 30 beats per minute upon standing.
Other known triggers include surgery, pregnancy, concussions, and periods of extended bed rest. In some cases, POTS appears alongside autoimmune conditions or joint hypermobility disorders, suggesting the immune system and connective tissue may play a role.
How POTS Is Diagnosed
Diagnosis requires meeting specific criteria: a sustained heart rate increase of 30 beats per minute or more (40 for ages 12 to 19) within 10 minutes of standing, symptoms lasting at least three months, and no significant drop in blood pressure. That last point is important because it distinguishes POTS from orthostatic hypotension, a condition where blood pressure itself falls sharply on standing. In POTS, blood pressure generally stays stable while the heart rate climbs.
The simplest screening test happens in a doctor’s office. You lie down for several minutes, then stand while your heart rate and blood pressure are measured at least twice, at least one minute apart. A more formal evaluation uses a tilt table test: you lie flat on a motorized table for about five minutes, then the table tilts you to a near-standing angle. You stay in that position for anywhere from 5 to 45 minutes while your heart rate and blood pressure are continuously monitored. If you don’t develop symptoms, a medication may be given through an IV to provoke a response.
Because POTS symptoms overlap with anxiety, dehydration, thyroid problems, and other conditions, getting the right diagnosis often takes time. On average, patients see multiple specialists before someone connects the dots.
Daily Management Strategies
The first-line treatments for POTS aren’t medications. They’re lifestyle changes, specifically increasing salt and fluid intake and starting a structured exercise program.
Salt helps your body retain fluid and expand blood volume, directly addressing one of the core problems in POTS. A Heart Rhythm Society expert consensus recommends 10,000 to 12,000 milligrams of salt per day (about 4,000 to 4,800 milligrams of sodium) for POTS patients. That’s roughly two to three times what most people consume. For context, a teaspoon of table salt contains about 2,300 milligrams of sodium. Many people use salt tablets or electrolyte drinks to hit these targets, since getting that much from food alone is difficult.
Compression garments, particularly waist-high compression stockings or abdominal binders, help prevent blood from pooling in the legs and abdomen. Sleeping with the head of the bed slightly elevated can also help the body adjust to positional changes.
Exercise as Treatment
Exercise is one of the most effective interventions for POTS, but it has to be approached carefully. Standing exercise often makes symptoms worse initially, so structured programs start entirely in horizontal or seated positions. The most widely used protocol, developed at the Children’s Hospital of Philadelphia and based on research from UT Southwestern, follows a specific progression over several months.
During months one through three, all cardio is done on a recumbent bike, rowing machine, swimming pool, or seated stepper. In month four, patients transition to an upright stationary bike. By month five, they move to an elliptical or treadmill walking without incline. From months six through eight, the program adds arm movement on the elliptical, incline on the treadmill, jogging, and stair climbing as tolerated. Strength training runs alongside cardio throughout the program.
This gradual approach works because it reconditions the cardiovascular system without triggering the very symptoms that make exercise feel impossible. Many patients see meaningful improvement by the end of the program, though it requires consistency and patience.
Medications for POTS
When lifestyle changes alone aren’t enough, several medications can help. The two most commonly prescribed target the core problems of low blood volume and poor blood vessel constriction.
One approach uses a medication that acts like a hormone your kidneys respond to, causing them to hold onto more salt and water. This expands blood volume so there’s more fluid available when you stand. Another medication works by tightening blood vessels in the limbs, reducing the pooling that triggers the rapid heart rate. Some patients benefit from low-dose medications that slow the heart rate directly, taking the edge off the tachycardia itself.
No single medication works for everyone, and treatment often involves trying different combinations. The choice depends partly on which POTS subtype a person has. Someone with the hyperadrenergic form, driven by excess stress hormones, may need a different strategy than someone whose primary issue is nerve damage in the legs.
Living With POTS
POTS is a chronic condition, but it’s not necessarily permanent. Some people, particularly those whose POTS was triggered by a virus or deconditioning, improve significantly over months to years. Others manage symptoms long-term with a combination of salt, fluids, exercise, compression, and medication.
Day-to-day management involves learning your personal triggers. Heat, prolonged standing, large meals, alcohol, and dehydration are common ones. Small adjustments, like crossing your legs while standing, drinking fluids before getting out of bed, and avoiding long hot showers, can make a noticeable difference in how you feel throughout the day.