Abscess thorax is pus in the pleural cavity, while lung abscess is pus in the lung. The specific differences are as follows: 1. different sites: one is the pleural cavity and the other is the interior of the lung; 2. different causes: abscess thorax is caused by inflammation in the lung, while the main cause is abscess thorax produced by pleural fistula and esophageal fistula. There also exist abscess thorax produced by foreign body in chest cavity after chest wall trauma, and there are few patients with abscess thorax caused by blood transport; lung abscess is mainly caused after lung infection, and the main cause is pneumonia, such as lung infection, etc. Necrosis is caused after lung inflammation, and necrosis is equivalent to a pus cavity in the lung; 3. Treatment is different: abscess thorax needs anti-inflammation plus drainage, and lung abscess inflammation also needs anti-inflammation and drainage. But abscess chest can also be caused by pleural fistula, and it is especially important to deal with pleural fistula at this time.