Bronchitis, a condition that can cause symptoms of fever if it is acute inflammation. During the acute phase of inflammation, the pathogens in the body stimulate the body's temperature regulation center, leading to chills and fever. Clinically, there may also be an acute facial expression, accompanied by complications such as difficulty breathing and cyanosis of the lips. If it is chronic bronchitis, fever symptoms generally do not occur, with the main symptoms being cough, sputum production, and difficulty breathing. Diagnosis requires combination with laboratory test results, and treatment measures and plans should be taken according to the cause of the disease.