The VAS typically consists of a horizontal line, usually 10 centimeters in length, with descriptors at each end. One end of the line represents "no pain" or "no symptom," and the other end indicates "worst imaginable pain" or "maximum symptom." Patients are asked to mark a point on the line that corresponds to their subjective experience. The distance from the "no symptom" end to the patient's mark is measured in centimeters or millimeters to quantify the symptom intensity.
