Postural Orthostatic Tachycardia Syndrome, commonly called POTS, is a condition where the body has difficulty regulating heart rate and circulation when changing positions, particularly when moving from sitting or lying down to standing.

The autonomic nervous system normally adjusts blood pressure, heart rate, and blood flow automatically throughout the day. When you stand, the body quickly tightens blood vessels and adjusts heart rate so blood continues circulating to the brain.

In POTS, this regulation does not happen efficiently. Blood may pool in the lower body rather than circulating properly back to the heart and brain. To compensate, the heart begins beating faster in an attempt to maintain blood flow.

For many people, this creates symptoms such as dizziness, rapid heart rate, fatigue, and brain fog when upright. These symptoms can feel sudden, confusing, and difficult to explain, especially when standard tests do not immediately identify the cause.

Although awareness of POTS has increased in recent years, many people still spend years searching for answers before the pattern is recognized.

When Balance Shifts

Circulation relies on a coordinated response between blood vessels, the heart, and the autonomic nervous system.

When this system becomes dysregulated, blood vessels may not tighten properly when standing. Blood may collect in the lower half of the body, reducing circulation to the brain.

The body responds by increasing heart rate in an effort to maintain blood flow. This compensatory response can create symptoms such as racing heart, dizziness, and fatigue.

Several factors can influence how well the body regulates circulation. These may include changes in blood volume, nervous system regulation, viral illness, connective tissue differences, inflammation, and overall metabolic support.

Because the autonomic nervous system also interacts with digestion, hormones, and the immune system, people with POTS often experience symptoms in multiple systems at once.

Common Signals of POTS

• Rapid heart rate when standing

• Dizziness or lightheadedness

• Fatigue or reduced exercise tolerance

• Brain fog or difficulty concentrating

• Shortness of breath

• Heart palpitations

• Temperature sensitivity

• Digestive symptoms such as nausea or bloating

• Feeling faint or near fainting

Symptoms often vary from day to day depending on hydration, stress levels, sleep quality, and nervous system load.

Understanding how circulation and nervous system regulation work together can help bring clarity to symptoms that may otherwise feel unpredictable. When hydration, circulation, nervous system balance, and metabolic support are addressed together, many people begin to experience improved stability and energy.