Similar to pain, dyspnea is subjective, ... and at its worst, using an appropriate scale such as the Visual Analog Scale (VAS) or Borg -- see below) Any associated symptoms (eg, cough, dizziness) ...

The researchers will also ask you to mark on a line how breathless you feel. This is called a visual analogue scale (VAS). The team will explain this to you. You see the doctor again at 2 and 4 weeks.