Bronchitis is a common respiratory infection. First, it is important to rest, drink plenty of water, abstain from smoking and alcohol, and avoid foods that are highly irritating. Do not eat spicy foods like chili peppers, avoid seafood, and reduce consumption of greasy foods like meat. Instead, eat more fresh vegetables and fruits. You can use pear with rock sugar and Fritillaria cirrhosa to make a drink that helps dilute phlegm and relieve coughing. The treatment mainly involves choosing antibacterial drugs to control the infection and using medications to dilute phlegm and relieve bronchial smooth muscle spasms. In addition, it is important to measure body temperature and ensure the room is well-ventilated and disinfected. (The use of medications should be under the guidance of a doctor.)