Inflammation of the lower lobe of the left lung is classified as pneumonia. Inflammation of the lower lobe of the left lung is categorized according to the location of the pathology and belongs to a kind of pneumonia. Patients can have fever, cough, sputum, and even symptoms of breath-holding and dyspnea, and when the inflammation involves the pleura, it can cause left-sided chest pain, tingling sensation, and is associated with respiration. The diagnosis of inflammation of the lower lobe of the left lung can be clarified through routine blood and C-reactive protein tests that reveal elevated leukocytes and neutrophils, elevated C-reactive protein, and chest X-rays or CT exams that reveal vague shadows of increased density visible in the left lower lobe of the lung. Inflammation of the lower lobe of the left lung is mostly caused by bacterial infections, which are usually treated with broad-spectrum antibiotics, such as penicillin, cefixime, levofloxacin, etc., as well as cough and phlegm medications, such as aminoglutethimide hydrochloride, Bicuculline and other symptomatic treatments. If there is fever, physical cooling can be given, and those with high fever can be given ibuprofen, acetaminophen and other drugs to reduce fever. It should be noted that inflammation of the lower lobe of the left lung can also be caused by viral infections, allergic factors, inhalation injuries and so on. A comprehensive analysis is needed to determine the cause of the disease and give appropriate medication.