Postural orthostatic tachycardia syndrome (POTS) is a complex and often misunderstood disorder of the autonomic nervous system. It primarily affects blood flow regulation, leading to a dramatic increase in heart rate — or pulse — when a person moves from lying down to standing up. This condition can cause debilitating symptoms, with dizziness and syncope (fainting) being among the most common and distressing.

What Exactly is POTS?

The name itself defines the problem: postural (related to posture), orthostatic (relating to standing upright), tachycardia (abnormally rapid heart rate), and syndrome (a collection of symptoms). When someone with POTS stands up, gravity pulls blood into the lower limbs. In a healthy person, the autonomic nervous system quickly constricts blood vessels and adjusts the pulse to maintain blood flow to the brain. In POTS, this response is dysfunctional. Blood pools in the legs, and the heart races — often increasing by 30 beats per minute or more within 10 minutes of standing — to compensate.

The Link Between Orthostatic Stress and Dizziness

Dizziness is one of the hallmark complaints in POTS. It is not the spinning sensation of vertigo but rather a feeling of lightheadedness, wooziness, or impending faintness. This occurs because, despite the rapid pulse, not enough oxygenated blood reaches the brain. Patients often describe it as “head rush” that doesn’t go away. This orthostatic dizziness can be so severe that it prevents standing for more than a few minutes, drastically affecting daily life.

Syncope: When Dizziness Turns to Fainting

Syncope, or temporary loss of consciousness, is a more extreme consequence. When the blood pressure drops while the pulse races, the brain can momentarily shut down. Unlike some other causes of fainting, POTS-related syncope is often preceded by a long period of warning symptoms like dizziness, visual changes, and profound fatigue. While not everyone with POTS faints, recurrent syncope is a serious complication that requires careful management. The fear of passing out can also lead to anxiety and avoidance of standing activities.

How Does POTS Affect Your Pulse?

Your pulse is the very heart of the diagnosis. In POTS, the pulse is abnormally reactive to posture. While a normal resting pulse might be 60–80 bpm, a person with POTS may see their pulse soar to 120–170 bpm simply from standing. This is not a sign of fitness but rather a sign of autonomic dysregulation. Monitoring pulse at home — using a smartwatch or manual check — can help patients and doctors track the severity of the condition. Many POTS patients learn to pace their activities by listening to their pulse.

• Resting pulse: Typically normal (60–80 bpm) when lying down.
• Standing pulse: Rapid increase of ≥30 bpm within 10 minutes.
• Syncope heart rate: May briefly drop or remain very high just before fainting.

Living with POTS: Practical Management

While there is no cure, many strategies help reduce dizziness and prevent syncope. Increasing salt and fluid intake helps expand blood volume, supporting the orthostatic response. Compression garments (stockings or abdominal binders) physically counter blood pooling. Medications like beta-blockers or midodrine may be prescribed to stabilize pulse and blood pressure. Importantly, graded exercise — starting with recumbent biking or swimming — can retrain the autonomic system over time. However, any new treatment should be discussed with a healthcare provider familiar with POTS.

When to Seek Medical Help

Experiencing frequent dizziness, an unexplained rapid pulse upon standing, or episodes of syncope warrants a medical evaluation. A tilt-table test is the gold standard for confirming POTS. Early diagnosis can dramatically improve quality of life. If you or someone you know shows signs of orthostatic intolerance, do not ignore them.