Common symptoms of acute bronchitis include coughing and expectoration. Some patients may experience chest tightness and shortness of breath. It is generally advised to rest during the illness period, as exercise is not recommended. Exercise increases lung capacity and the volume of air entering and leaving the airways, which can directly stimulate the respiratory tract, leading to worsened symptoms such as coughing and chest tightness. Additionally, after physical activity, the consumption of oxygen increases, which may lead to breathing through the mouth. This means the air bypasses the nasal cavity's filtering and warming, directly irritating the respiratory tract and exacerbating the symptoms of acute bronchitis. Therefore, it is advised to rest and avoid exercise, especially high-intensity activities, during an episode of acute bronchitis.