The diagnosis of bronchitis is primarily established through a detailed patient history and a comprehensive physical examination. The symptoms described by the patient are carefully evaluated. Since acute bronchitis often emerges following upper respiratory tract infections, this information provides an important clue in the diagnostic process. When necessary, additional tests such as blood tests, sputum culture, pulmonary function tests, blood gas analysis, chest X-ray, or computed tomography may be requested. These personalized evaluations not only help confirm the diagnosis of bronchitis but also aid in ruling out other diseases that may have similar symptoms.