Fibrous and calcified foci in the lungs may be due to chronic inflammation, scar tissue from old tuberculosis, and other injuries. 1. Chronic inflammation: Fibrotic foci and calcified foci in the lungs may be caused by chronic inflammation, which may be caused by the patient’s long-term exposure to dust-contaminated areas, air pollution, or chronic inflammation due to long-term smoking, which may lead to symptoms such as fibrosis in the lungs. 2. Scar tissue of old tuberculosis: fibrous foci and calcified foci in the lungs may also be caused by the necrosis of the scar tissue of old tuberculosis, which leads to the obstruction of lymphatic reflux and the accumulation of necrotic tissue in the local area, resulting in fibrous foci and calcified foci in the lungs. 3. Other injuries: such as trauma, pneumothorax and other lung tissue injury after healing, there may be pulmonary fibrous foci, calcium deposition in the injured part may appear calcified foci. Lung fibrous foci and calcified foci may have other causes, it is recommended that patients go to the hospital in time for examination, improve the examination, clarify the cause and diagnosis, and standardize the treatment under the guidance of the physician, so as not to cause delays in the condition.