POTS: a syndrome, not a single disease

Postural orthostatic tachycardia syndrome (POTS) describes a pattern of symptoms and test findings that happen when you’re upright — fast heart rate, light-headedness, “brain fog,” fatigue, shakiness, heat intolerance, and sometimes near-fainting. It’s called a syndrome because different biological pathways can lead to the same outward picture. In this article, a consultant cardiologist Dr Gosia Wamil provides a breakdown of POTS diagnosis, treatment, and how patients can still lead normal lives.

How doctors make (and confirm) the diagnosis

Diagnosing POTS isn’t about one quick test. It’s about showing a consistent heart-rate rise when upright and ruling out other causes. The usual criteria are:

Adults: heart rate rises ≥30 beats/min (without a drop in blood pressure) within 10 minutes of standing or tilt-table testing.
Teens: rise ≥40 beats/min.
Symptoms should be present for three months or more and improve when you lie down.

Your clinician will often use a 10-minute stand test in the clinic or a tilt-table test in a specialist unit. Equally important is checking for look-alikes — anaemia, dehydration, thyroid issues, medication side-effects, heart rhythm problems — because treating these can dramatically help.

Why POTS happens: common “endotypes” (sub-patterns)

POTS isn’t one disease. Common underlying patterns include:

Low blood volume and deconditioning: the circulation struggles to push blood back to the heart when upright.
Neuropathic POTS: the nerves that tighten leg/abdominal blood vessels work poorly, so blood pools in the lower body.
Hyperadrenergic POTS: the body releases extra adrenaline/noradrenaline standing up—causing tremor, palpitations, anxiety-like feelings.
Post-viral or post-COVID POTS: POTS-type symptoms can follow infections, including COVID-19, in a subset of people.

Many people also have overlapping conditions such as joint hypermobility/EDS, migraine, mast-cell activation symptoms, or autoimmune features — each can influence management choices.

Hormones and POTS: why symptoms can flare

POTS affects women more often, and symptoms often vary across the menstrual cycle. Oestrogen and progesterone shifts, fluid changes, and prostaglandins around periods can lower upright tolerance, raise heart rate, and worsen fatigue or presyncope. Some patients also notice changes around perimenopause. Tracking symptoms with a cycle app helps tailor treatment (such as iron checks if bleeding is heavy, salt/fluid adjustments, and medication timing).

What good care looks like

First-line (for everyone):

Fluids and salt – target two to three litres of water/day and increased salt (often 6 to 10 g/day) to expand blood volume.
Compression – waist-high compression (or abdominal binder) to reduce blood pooling.
Graded exercise – start recumbent (rowing machine, recumbent bike, swimming) and slowly build upright time; think “months, not weeks.”
Sleep, pacing and heat management – regular sleep, smaller meals, avoid very hot environments, rise slowly from bed, consider elevating the head of the bed.

Medications (individualised and usually added step-wise):

Low-dose beta-blocker (such as propranolol) to blunt the HR surge.
Ivabradine for inappropriate sinus acceleration.
Midodrine (tightens blood vessels) for pooling, taken during the daytime.
Fludrocortisone (helps retain salt/water) if blood volume is low.

Sports and activity: yes (with a smart plan)

Exercise is treatment, but it has to be structured:

Start horizontal, progress gradually: begin with recumbent bike/rower or swimming, 3–4 sessions/week, short and easy. Add gentle resistance training (especially legs and core) to help the muscle-pump.
Build upright tolerance slowly: after several weeks, introduce short upright intervals, increasing as symptoms allow.
Pre-hydrate and salt: a big glass of water (or an oral rehydration drink) and a salty snack 30 to 60 minutes before sessions often helps.
Cool-down and compression: avoid abrupt stops; consider compression garments during/after.
Expect flare/plateau phases: consistency matters more than intensity. Most programmes run more than three months before clear gains

Living well with POTS: practical tips

Morning routine: drink water before getting out of bed; rise in stages.
Small, frequent meals: large, high-carb meals can worsen pooling; some feel better with smaller portions and balanced protein.
Heat awareness: hot showers, saunas, and summer heat can trigger symptoms—cool the bathroom, use lukewarm water.
Travel and school/work: plan hydration breaks, use compression on long journeys, and discuss reasonable adjustments with employers/schools.
Mental health support: the condition is real and physical, but it’s normal to feel low or anxious when life is restricted; brief psychological support can help coping and symptom control.

When to seek specialist help

Fainting, chest pain, breathlessness out of proportion to usual symptoms.
Rapid weight loss, very heavy periods, or iron-deficiency symptoms.
If you’re not improving after several months of consistent lifestyle steps.

Dr Gosia Wamil sees patients with POTS at the Mayo Clinic in London and the Manor Hospital in Oxford.