Postural Orthostatic Tachycardia Syndrome (POTS) is a condition that affects circulation and the autonomic nervous system, causing an abnormal increase in heart rate when transitioning from lying down to standing. Symptoms can include dizziness, lightheadedness, fatigue, heart palpitations, and brain fog. POTS is often linked to conditions like Ehlers-Danlos Syndrome, autoimmune disorders, and viral infections such as Long COVID. Treatment typically focuses on lifestyle adjustments, increasing fluid and salt intake, medications, and physical therapy to help regulate blood flow and heart rate.