Whether the lungs can be recovered or not needs to be analyzed on the cause, anatomically the lungs become black, such as long-term inhalation of black dust, particles can not be completely recovered; imaging lungs become black, such as chronic small airway lesions may be recovered, malignant tumors can not be recovered. 1. Anatomy: if the lungs become black due to long-term inhalation of black dust and particles, such as long-term smoking or working in a heavily polluted environment, a large amount of black precipitate will be deposited in the lungs, which will lead to blackening of the lungs, and this situation cannot be fully recovered. Although smoking is stopped or the working environment is left, the black precipitate that has already been caused cannot disappear automatically. 2. Imaging: It refers to the imaging changes shown in CT or X-ray. (1) In case of chronic small airway pathologies such as bronchitis and emphysema, which cause excessive gas retention and high air content in the lung tissues, blackening of the lungs can also result. If the condition improves with causative treatment in a regular hospital, the blackened lungs will also improve and may return to normal. (2) In the case of malignant tumors, it can cause damage to the mucous membrane of the lungs and cause old blood clots, leading to blackening of the lungs. Since the condition is more serious and the damage to the lungs is heavier, it is difficult for the blackened lungs to return to normal.