In the case of bronchitis, the onset is relatively rapid, often with symptoms of upper respiratory tract infection and mild systemic symptoms. Fever is not a common symptom of bronchitis. If a patient with acute bronchitis develops a fever, the temperature is usually around 38°C, and most fevers can be reduced to normal in three to five days. There may be a cough and sputum, starting with a dry cough or a small amount of thin white sputum, which slowly turns into mucus or purulent sputum, and the cough intensifies. Occasionally, there may be blood in the sputum, and the cough and sputum usually last for 2-3 weeks before disappearing. However, there are usually no other clinical signs. In a few patients, scattered dry and wet rales can be heard in both lungs, and the rales may decrease or disappear after the sputum is coughed out. For bronchitis, it is important to treat the disease promptly, drink more water, and eat a diet that is easy to digest and nutritious. In addition, pay attention to open the windows and keep the air fresh in the room.