The initial stage of acute bronchitis is often accompanied by symptoms of upper respiratory tract infection, such as fever, headache, nasal congestion, sore throat, hoarseness, physical weakness, and muscle aches. Initially, the cough is mainly dry or with a small amount of sputum. As the disease progresses, the amount of sputum will gradually increase, the cough will worsen, and blood or purulent sputum will appear in the sputum. The cough can continue for 2-3 weeks and can evolve into chronic bronchitis if there is a prolongation. It is often accompanied by bronchospasm and may present with varying degrees of chest tightness and shortness of breath. Physical examination may be unremarkable, or scattered dry or wet rales may be heard in both lungs, with variable location, decreasing or disappearing with coughing. Chest x-ray shows thickened lung texture, total white blood cell count and neutrophils are usually elevated, blood sedimentation is accelerated, and sputum culture suggests the presence of pathogenic bacteria, and symptomatic treatment and antibiotic therapy are usually given.