Pneumonitis, is often confused with pneumonia, but these are similar ailments but not the same. While pneumonia is a type of infection which causes lung inflammation, pneumonitis is a general term to describe inflammation in pulmonary, or lung, tissue. So technically pneumonia would fall into the category of being a type of pneumonitis, but generally most physicians look to other causes of lung inflammation when referring to a patient having "pneumonitis." These other causes vary dramatically, from airborne irritants, to different types of cancer treatments, and even some antibiotics or aspirin. Airborne irritants are probably the most common cause of pneumonitis and can stem from being exposed to a type of chemical, dust, or bacteria.
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