Lung nodular sclerosis foci are clinically known as pulmonary sclerosing foci, which refers to the fibrosis of the patient’s lung tissues. 1. Lung nodular sclerosis is usually caused by infection of the tissue cells in the patient’s body, resulting in localized fibrous tissue proliferation, which induces lung nodular sclerosis. 2. They are usually detected during chest imaging tests and are mostly old lesions caused by chronic lung infections such as tuberculosis. 3. Hard nodules in the lungs are usually a manifestation of old tuberculosis, and generally do not require special treatment by the patient, and regular review is sufficient. It is recommended that patients should go to the hospital in time to improve the relevant examinations, and be actively treated under the guidance of the doctor, so as to avoid delaying the condition.