Respiratory distress grading standard Grade 1 No shortness of breath when walking on the same level as a healthy person of the same age, but shortness of breath when climbing a mountain or going upstairs. Grade 2: No shortness of breath when walking 1 km on level ground, but unable to maintain the same speed as a healthy person of the same age; shortness of breath when walking fast on level ground; shortness of breath is obvious when climbing or going upstairs. Grade 3: Shortness of breath when walking 100 meters on a flat road. Han Zhenggui, Emergency Department, Sanya Traditional Chinese Medicine Hospital Grade 4 Shortness of breath with a little activity, such as dressing or talking.