What department should I go to for pneumonia? Pneumonia, as the name suggests, is a lung disease, which is to say it is a disease of our respiratory system. Therefore, the most appropriate department to visit would be the Department of Respiratory Medicine. If the patient's condition is relatively stable, they can visit the outpatient Respiratory Medicine department. Of course, there are a small number of patients whose condition is very critical, and in such cases, they must first visit the Department of Emergency Medicine. The doctors in Emergency Medicine will decide based on the patient's condition whether their next step should be to go to Respiratory Medicine, be admitted for in-hospital treatment, remain in the emergency for observation, or need to be admitted to the ICU for further emergency treatment.