Subpleural inflammatory nodules in the apical posterior segment of the upper lobe of the left lung may be tuberculosis foci or may be caused by common flora such as Streptococcus pneumoniae. The main sites of tuberculosis in the human body are the apical posterior segment of the upper lobe and the dorsal and posterior basal segments of the lower lobe. Clinically, if nodules are found in these areas, first consider the possibility of tuberculosis. Secondly, inflammatory nodules, which may be caused by common flora such as Streptococcus pneumoniae, may become smaller and absorbed after active anti-inflammatory and symptomatic treatment and follow-up CT of the lungs. Those who are suspected of having tuberculosis should go to designated hospitals for consultation, through relevant examinations to clarify whether it is tuberculosis, if it is tuberculosis, then it is necessary to strictly by professional doctors to formulate a detailed treatment plan, and strictly follow the treatment cycle of treatment.