For many people with Postural Orthostatic Tachycardia Syndrome, the hardest moments are often the simplest ones. Standing up, walking across a room, stretching after sitting, or even turning the head too quickly can trigger a wave of symptoms. Lightheadedness, rapid heartbeat, weak legs, dizziness, brain fog, and a sudden feeling of instability can appear within seconds. Although these reactions feel alarming, they are deeply connected to how the body regulates posture, blood