Orthostatic tachycardia, full name is postural orthostatic tachycardia syndrome (POTS).
It is referring to a shift from lying down to standing causes an abnormally large increase in heart rate.
Symptoms can include dizziness, difficulty thinking, blurred vision or weakness.
It means that the condition is related to the body's posture. Uprightness also suggests a relationship with the body's position, with dizziness and a sudden drop in blood pressure.
Tachycardia is when the heart is racing, usually about 100 beats per minute.
Syndrome means that it is not a disease, but a set of symptoms that often meet.
Keywords: orthostatic tachycardia; orthostatic tachycardia syndrome