Calcified foci in the lung can appear in a variety of diseases, and the specific survival time is related to the primary disease. Benign calcified foci usually do not affect the life expectancy of patients, while calcified foci formed by malignant diseases or those caused by pneumoconiosis have a shorter life expectancy, and the specific survival time is related to treatment and cannot be generalized. Calcified foci in the lungs are most commonly seen in tuberculosis or inflammatory lung disease. If the inflammation is too extensive to be repaired with normal or microscopic tissue, calcium salt deposits may appear at the site of the lesion, resulting in calcified foci, which are old lesions in the lungs. Such calcified foci can persist long after recovery from the primary disease and do not affect the patient’s life expectancy. In addition, pneumoconiosis can also develop calcified foci, which may lead to death in 1-2 years if the pneumoconiosis progresses rapidly and no effective treatment is available. In addition, malignant tumors can also develop calcified foci, which can significantly shorten a patient’s life span if they are poorly treated or if they develop metastases. In conclusion, there is no need to panic when patients develop calcified foci in the lungs. CT examinations should be performed to clarify the nature of the lesions before taking appropriate treatment.