Pulmonary inflammation is a common term that actually refers to pneumonia, which is an acute inflammation of the lung tissue due to a variety of causes, the specific causes of which are both infectious and non-infectious, as follows: 1. Infectious factors: Infection caused by various pathogens, such as infection with bacteria, causing bacterial pneumonia, or infection with viruses, causing viral pneumonia. 2. The main reasons for this are: 1. Infectious factors: infections caused by various pathogens, such as bacterial pneumonia, or viral pneumonia caused by viruses, and fungal infections, mycoplasma, chlamydia, etc. 2. Non-infectious factors: mainly physical and chemical factors, exposure to radiation, and immune causes, such as allergic pneumonia caused by allergic factors, and radiation pneumonia caused by prolonged exposure to radiation.