Non-Neoplastic Lung Disorder Pneumonia Pneumonia pneumonia Patient_developed_pneumonia An acute, acute and chronic, or chronic inflammation focally or diffusely affecting the lung parenchyma, due to infections (viruses, fungi, mycoplasma, or bacteria), treatment (e.g. radiation), or exposure (inhalation) to chemicals. Symptoms include cough, shortness of breath, fevers, chills, chest pain, headache, sweating, and weakness. Pneumonia, NOS