Patients with acute bronchitis usually do not experience severe conditions. Acute bronchitis typically presents symptoms of dry cough and is generally self-limiting, usually not leading to severe consequences. However, it is important to note that patients with acute bronchitis may sometimes experience significant chest tightness and wheezing, which can be particularly prominent in children and may even lead to respiratory failure. Additionally, acute bronchitis can sometimes be associated with other conditions, such as bacterial pneumonia. If combined with bacterial pneumonia, it could also lead to severe complications like respiratory failure. In such cases, the patient's condition is relatively severe, and close observation of the condition is necessary.