Can Lupus Cause POTS? The Autoimmune Connection

Lupus can disturb the automatic nerves that keep your heart rate and blood pressure steady when you stand, and POTS is one of the forms that disturbance can take. Still, lupus is behind only a small minority of POTS cases, so most people with POTS don’t have lupus.¹ The connection runs through the immune system, which is why doctors increasingly look at POTS and autoimmune disease side by side.

What POTS Is and Why Lupus Can Trigger It

POTS (postural orthostatic tachycardia syndrome) means your heart rate jumps by at least 30 beats a minute within 10 minutes of standing, without a big drop in blood pressure. People feel lightheaded, shaky, foggy or tired when upright and better lying down. The reason is that the automatic nerves that run heart rate and the tightening of blood vessels aren’t adjusting properly, and the pounding heart is the body compensating for blood pooling in the legs.

Heat, big meals and long stretches on your feet usually make it worse, and lying down usually eases it within minutes. Because the tiredness and weakness overlap with lupus fatigue or anaemia, it’s easy to blame those instead. People who already have lupus can develop POTS later, so new standing symptoms deserve to be raised rather than blamed on fatigue. It also differs from ordinary lightheadedness, which usually passes in seconds. POTS symptoms tend to build and persist for as long as you stay upright.

Two related patterns are worth knowing. In one, blood pressure falls on standing rather than heart rate climbing. The other is fainting spells triggered by standing. All three are automatic-nerve problems, and all can appear in lupus.

Nerve biopsies in lupus nerve damage have shown a wearing-away of nerve fibres and inflamed blood vessels around them.² Lupus can also be complicated by an immune attack on the relay stations of these nerves, shown by a specific antibody, as in one reported case.³

Proving cause is hard, though. Both conditions favour young women, so they can coincide by chance. Infections and other triggers can set off both, and POTS itself can follow viral illness, pregnancy, surgery or prolonged bed rest, any of which a person with lupus may have had before symptoms began. Anaemia, or reduced activity during a flare, can add to standing symptoms too. That’s why doctors often call the overlap “associated”: a link seen in groups of people rarely proves that lupus caused one person’s POTS.

How Often Lupus and Autoimmunity Show Up in POTS

About 2% of people with POTS have lupus, compared with at most about 0.1% of the general population.⁴ Broader autoimmunity is more striking: about 1 in 5 people with POTS have some autoimmune disease, versus under 1 in 10 in the general population.⁵ Hashimoto’s thyroid disease is the most common, in about 11%, followed by rheumatoid arthritis in about 4%.⁶

Antibody blood tests tell a similar story. A positive ANA, from a blood test that flags immune activity against the body’s own cells, shows up in about 25% of people with POTS versus 16% of others.⁷ Because so many healthy people test positive, a positive ANA alone doesn’t mean lupus. Antiphospholipid antibodies, linked to clotting problems, appear in about 7% of people with POTS versus 1% of others.⁸

If you have POTS and a positive ANA, ask whether the level was low or high. An ANA result comes with a titer, such as 1:80 or 1:320, and a pattern. Higher titers are more meaningful than low ones, though neither alone makes a diagnosis.

Lupus is diagnosed from the whole picture: symptoms such as joint pain, rash or kidney involvement, plus more specific antibody tests like anti-dsDNA. If your ANA test is positive and you have none of those symptoms, often no autoimmune disease is present. A rheumatologist can decide whether follow-up is sensible.

The Antibody Theory Behind Autoimmune POTS

In one group of people with POTS, about 9 in 10 had raised antibodies against a receptor that tightens blood vessels.⁹ More than half also had antibodies against receptors that slow the heart and control glands.¹⁰ When these heart-related antibodies are higher, symptoms tend to be more severe.¹¹ So some POTS may be driven by the immune system attacking the receivers of nerve signals.

These findings show an association rather than proof that the antibodies cause symptoms. Many people with POTS have no clear autoimmune disease, so these antibodies are one proposed explanation among several, and likely not the whole story.

Not every antibody matters. Antibodies that can block signals at nerve relay stations may contribute to automatic-nerve problems.¹² But low levels of these antibodies turn up about as often in healthy people as in people with POTS (7% vs 8%).¹³ A low-positive result on this test shouldn’t be read as proof of autoimmune POTS.¹⁴

That affects whether to ask for testing. Receptor antibody tests are mostly offered by research or specialist labs, and methods differ, so results from one lab can’t easily be compared with another. For most people, a result wouldn’t change the usual first steps of fluids, salt, compression and carefully chosen medicines. It may matter more if you and a specialist are weighing immune treatments for severe symptoms, and even then it is one piece of evidence rather than the deciding one.

Getting Diagnosed When You Have Lupus

A tilt table test, where you lie strapped to a table that tilts you upright while heart rate and blood pressure are tracked, is a useful objective test in lupus.¹⁵ Repeating it can show whether treatment is working.¹⁶ In people with related conditions like Sjögren’s, tilt testing picks up both POTS-type heart rate rises and blood pressure drops.¹⁷

Before your appointment, you can do a simple standing check at home. Lie flat and rested for five minutes, then note your pulse, using a watch, a phone app or a home blood pressure cuff that shows pulse. Stand still, without leaning or walking, and record your pulse again at 2, 5 and 10 minutes, noting any symptoms as they appear. A rise of 30 beats a minute or more from your lying-down reading is worth reporting, though home readings are only a clue and the clinic tilt test is what confirms it. Do this with someone nearby and a chair within reach, and sit or lie down right away if you feel faint.

Your rheumatologist manages lupus, while a cardiologist or autonomic neurologist usually runs tilt testing. Sharing results between them avoids duplicated tests. Other things can explain the same symptoms and are worth ruling out: anaemia from lupus, dehydration or low blood volume, medication side effects, and thyroid problems, which are common alongside POTS.

Does Treating Lupus Help POTS

Most people start with measures that carry little risk. Drinking more fluid through the day helps expand blood volume, and many people with POTS are also advised to add extra salt. If lupus affects your kidneys or you have high blood pressure, check any salt advice with your doctor before changing your intake. Compression stockings or an abdominal binder help limit blood pooling in the legs and belly when you stand. Gradual exercise starting lying or seated, such as rowing or recumbent cycling, is usually tolerated better than upright exercise, with intensity built up slowly.

Research on drugs for POTS linked to systemic disease is limited, but low-dose beta blockers are a common starting point, especially for a racing heart.¹⁸ Higher doses can cause tiredness, dizziness and blood pressure drops on standing, so doses are usually far lower than those used for high blood pressure.¹⁹ With so little evidence, treatment is typically adjusted step by step according to how you respond.

Immune treatments have helped in severe cases. In three people with lupus and severe automatic-nerve problems, intensive immune suppression with cyclophosphamide returned tilt tests to normal.²⁰ In people with stubborn autoimmune nerve problems, about 8 in 10 improved on IVIG, antibody infusions from donated blood, many moving from mostly bedridden to nearly able to work.²¹ But in a controlled trial in autoimmune POTS, IVIG did no clearly better than a dummy infusion.²²

The cyclophosphamide result comes from only three people, and the IVIG improvements were reported in autoimmune nerve problems more broadly, not specifically in lupus-linked POTS. For these reasons immune treatment is reserved for severe cases and judged case by case. If immune treatment comes up, useful questions are whether your lupus is active elsewhere in your body, what the infection risks are, and how you’ll measure whether it worked, such as with a repeat tilt test.

Antiphospholipid Syndrome and Other Linked Conditions

Antiphospholipid syndrome (APS), a clotting-antibody condition that often occurs with lupus, has been linked to POTS and fainting disorders.²³ Those affected were mostly women around 40, many with migraine, memory problems or balance trouble.²⁴ Many also had blotchy lace-like skin and fingers that turn white in the cold.²⁵

APS raises the risk of blood clots, and a diagnosis can change treatment, sometimes including blood-thinning medicine. Because clotting-related antibodies can be checked with a blood test, it is reasonable to ask whether you have been tested, especially if you’ve never been. The skin and finger changes are clues worth mentioning. A positive antibody result usually needs repeating after some weeks before it counts toward a diagnosis, so one result isn’t the end of the question.

Persistent dry eyes and dry mouth suggest Sjögren’s, which can also affect the automatic nerves and often occurs alongside lupus. An overactive thyroid can cause a racing heart and palpitations that look like POTS or make it worse. A simple thyroid blood test is a reasonable early check, particularly since Hashimoto’s is the most common autoimmune condition found with POTS.