POTS stands for Postural Orthostatic Tachycardia Syndrome. Each word describes a piece of the condition: “postural” refers to body position, “orthostatic” means related to standing upright, “tachycardia” is a heart rate above 100 beats per minute, and “syndrome” indicates a cluster of symptoms that occur together. POTS is a disorder of the autonomic nervous system, the part of your body that controls involuntary functions like heart rate, blood pressure, and digestion.
What Happens in Your Body With POTS
When anyone stands up, gravity pulls roughly 10% to 15% of their blood downward into the abdomen, legs, and arms. Normally, the autonomic nervous system compensates almost instantly. It releases adrenaline and noradrenaline, which tighten blood vessels and nudge the heart to beat slightly faster, pushing blood back up to the brain.
In people with POTS, the blood vessels don’t respond properly to those signals. Blood pools in the lower body instead of being pushed back upward, and less of it reaches the brain. The heart keeps responding to the chemical signals by beating faster and faster, but the blood vessels won’t cooperate. The result is a racing heart, lightheadedness, brain fog, and fatigue that worsen the longer you stay upright.
How POTS Is Diagnosed
A POTS diagnosis requires a sustained heart rate increase of at least 30 beats per minute within 10 minutes of standing (or 40 bpm in children and adolescents, who naturally have higher heart rates). This increase has to happen without a significant drop in blood pressure, and symptoms must have been present for at least six months.
The most common diagnostic tool is a tilt table test. You lie flat on a motorized table, get strapped in, and the table tilts you to about a 70-degree angle, close to standing. You stay in that position for up to 45 minutes while your heart rate and blood pressure are continuously monitored. Doctors are looking for that characteristic heart rate spike without a corresponding blood pressure drop.
Symptoms Beyond a Fast Heart Rate
The racing heart is the defining feature, but most people with POTS deal with a much wider constellation of symptoms. Lightheadedness and near-fainting are common, especially during prolonged standing. Brain fog, difficulty concentrating, and fatigue are often the most disabling symptoms in daily life, even more than the heart rate changes. Many people also experience palpitations, exercise intolerance, nausea, headaches, and trembling.
Symptoms tend to flare with heat exposure, after meals (when blood diverts to the digestive system), during menstrual periods, and after prolonged bed rest or illness. Some people have mild symptoms that are mostly a nuisance; others are severely limited and unable to work or attend school.
Three Main Subtypes
POTS isn’t a single condition with one cause. It falls into three main subtypes based on the underlying mechanism:
- Neuropathic POTS involves damage to the small nerve fibers lining blood vessels. When those nerves break down, the vessels can’t tighten properly when you stand, allowing blood to pool.
- Hyperadrenergic POTS occurs when the fight-or-flight system is overactive, flooding the bloodstream with excess norepinephrine. This subtype often involves surges of anxiety, tremor, and high blood pressure alongside the fast heart rate.
- Hypovolemic POTS is driven by abnormally low blood volume. With less blood circulating overall, the body struggles even more to keep enough of it reaching the brain when you stand.
Some people have features of more than one subtype, which is one reason treatment can be complex.
Conditions That Often Overlap With POTS
POTS frequently shows up alongside other conditions. Ehlers-Danlos syndrome, a connective tissue disorder causing hypermobile joints and fragile tissue, is one of the most commonly reported associations. Mast cell activation syndrome, in which immune cells release inflammatory chemicals inappropriately, is another condition that clinicians increasingly see in POTS patients. The exact relationship between these conditions is still being studied, but the overlap is well recognized enough that doctors familiar with POTS will often screen for them.
Lifestyle Changes That Help
For many people, the first line of management isn’t medication. It’s a combination of increased fluid and salt intake to expand blood volume. Adults with POTS are generally advised to drink 2 to 3 liters of fluid per day and add 6 to 10 grams of extra salt daily (about 1 to 1.5 level teaspoons). This won’t be appropriate for everyone, particularly people with heart disease, kidney problems, or high blood pressure.
Compression garments, particularly waist-high stockings or abdominal binders, help prevent blood from pooling in the lower body. Elevating the head of the bed a few inches, avoiding prolonged standing, and eating smaller, more frequent meals can all reduce symptom flares.
Exercise as Treatment
Structured exercise is one of the most effective interventions for POTS, but it has to be approached carefully. The most widely used approach is a graded program that starts entirely in reclined or seated positions, such as recumbent cycling, swimming, or rowing, and gradually progresses over about eight months.
In the first two months, workouts are the least intense and limited to three days per week. Over time, the program introduces upright cycling, then treadmill walking on a flat surface, and eventually incline walking or jogging. Strength training is added on alternate days, starting with bodyweight exercises done lying down or seated before progressing to standing. The key principle is that you’re retraining the autonomic nervous system to respond more effectively, and pushing too hard too early tends to backfire, worsening symptoms rather than improving them.
Medications for POTS
When lifestyle changes and exercise aren’t enough, medications can help manage specific symptoms. The options target different parts of the problem. Some slow the heart rate directly. Others help tighten blood vessels to reduce pooling, or help the kidneys retain fluid to increase blood volume. The specific medication depends on which subtype of POTS is involved and which symptoms are most disabling. Because POTS varies so much from person to person, finding the right medication or combination often takes trial and adjustment.
It’s worth noting that evidence for POTS medications is limited compared to many other cardiovascular conditions. Most treatments are based on clinical experience and small studies rather than large trials, which is part of why management is so individualized.
Who Gets POTS
POTS most commonly affects women of reproductive age, though it can occur in men and in children. Onset often follows a triggering event: a viral illness, surgery, pregnancy, or a period of prolonged bed rest. The condition gained wider attention during and after the COVID-19 pandemic, as a significant number of long COVID patients developed POTS symptoms. For some people, POTS improves substantially over time, particularly with consistent exercise and lifestyle management. For others, it’s a long-term condition that requires ongoing treatment.