The VAS typically consists of a straight line, usually 10 centimeters in length, with endpoints defining extremes of the symptom being measured (e.g., "no pain" to "worst pain imaginable"). Patients mark a point on the line that corresponds to their perception of their current state. This mark is then measured from the "no pain" end, giving a score out of 10 or 100, depending on the length of the scale.
