Acute bronchitis is a very common inflammatory disease of the respiratory system, typically quite severe, mainly due to the body's low immune function, exposure to cold, rain, or infection by certain viruses or bacteria. Symptoms in patients include fever, cough, sputum production, shortness of breath, and chest tightness.

Usually, acute bronchitis can be completely cured within about one to two weeks with timely and effective anti-infective treatment, cough suppression, expectorants, and asthma relief. Once effectively and completely cured, acute bronchitis is not prone to recurrence.

The so-called recurrence may occur if the patient's acute bronchitis was not 100% fully cured, or if medication was stopped too soon, leading to the re-emergence of clinical symptoms such as cough and sputum production shortly after treatment.