Calcified foci in the middle lobe of the lung are stable, unchanging deposits of calcium in the middle lobe of the lung, with a density similar to that of bone, and are benign occupations. Clinically, calcified foci are stable, mostly due to damage to the lung, like tuberculosis, inflammation, air pollution, etc., which leads to the formation of calcified foci, or clinically, they may be damage left after the healing of tuberculosis, which manifests as calcified foci. For calcified foci in the middle lobe of the lung, no special treatment is needed, and regular chest CT examinations can be performed to determine whether new calcified foci appear and the growth rate of calcified foci to determine their benignity and malignancy. Clinically, the main focus of calcified foci is prevention, to prevent the lung from being damaged again, should pay attention to diet, standardized work and rest, and appropriate exercise in daily life.