Most cases are asthmatic bronchitis are caused by a virus and do not require treatment. Instead, supportive care may be offered to help ease symptoms as the viral infection runs its course.

How allergic bronchitis progresses from common allergens, recognize symptoms requiring medical care, and learn treatment strategies to protect your lungs.

Bronchitis can lead to pneumonia, which is a deeper and far more serious infection of the lungs’ air sacs. Pneumonia can develop in part of one lung or an entire lung or both lungs.

ROME (AP) — Pope Francis has developed pneumonia in both lungs, the Vatican said Tuesday, after new tests showed a further complication in the condition of the 88-year-old pontiff.