- Stage I – Mild: Symptoms may not be noticeable. You might be short of breath when walking fast or climbing a slight hill.
- Stage II – Moderate: Symptoms worsen from stage I. Coughing and mucus production may become more severe, and you may experience shortness of breath when walking or exercising.
- Stage III – Severe: You may have trouble catching your breath doing household tasks and may not be able to leave your house.
- Stage IV – Very Severe: You’ll likely have frequent flare-ups that can be potentially fatal. You may have trouble breathing even when you’re resting. You’re at risk of developing heart or lung failure.
