Postural Orthostatic Tachycardia Syndrome (POTS) is a condition that causes an increase in heart rate and other symptoms when standing upright. POTS diagnosis can be complicated because the symptoms can affect a wide range of organ systems, and the most bothersome symptom for each patient may differ. A healthcare provider will ask questions about your symptoms, medications, and medical history. They’ll also perform a physical exam. The main way providers diagnose POTS is through a tilt table test, which measures your heart rate and blood pressure as you change posture and position. Occasionally, other tests are performed to identify specific characteristics of POTS present in some patients. These findings, along with symptoms of orthostatic intolerance, must be present for at least three to six months for a person to be diagnosed with POTS.