Calcifications in the lungs are mostly caused by old tuberculosis. After standardized anti-tuberculosis treatment, nodules, calcifications, fibrosis, pleural thickening and other manifestations are easily seen in the lungs, and calcified foci are especially likely to appear. This is mostly benign at this point and does not require treatment, and dynamic follow-up of chest CT is sufficient. Calcified foci in the chest are also seen in patients with long-term smoking, long-term exposure to dust, including masonry, coal mining and other work, long-term exposure to dust, especially silica, in the lungs are prone to the formation of calcified nodules. If the nodules are widespread it can be assumed that the patient has the possibility of early silicosis, such nodules still do not require treatment. Depending on the number and distribution of calcified foci, it is possible to know the duration and nature of the patient’s exposure to dust. Therefore, the presence of calcified foci in the lungs is not a cause for alarm, as they are mostly old lesions and do not require special treatment.