14mm lung nodule is not directly based on the size to determine whether it is serious or not, the severity is related to the risk of benign and malignant. When 14mm lung nodule is benign nodule, it is not serious, only need regular review, can take oral medication for anti-infection treatment, if it is antibiotic-sensitive bacterial infection, can be treated with antibiotics such as cefuroxime; if it is tuberculosis bacterial infection, should be used to treat with medication such as rifampicin; if it is fungal infection, can be used to treat with medication such as amphotericin B, ashwagandha and so on. When the 14-mm lung nodule is malignant, the treatment is mainly surgical resection, lobectomy, mediastinal lymph node clearance with a view to achieving nodal resection, which is the preferred treatment, and adjuvant chemotherapy is not recommended for early-stage patients who are completely resected. For patients who cannot tolerate surgery, stereotactic radiotherapy can be used as a means of eliminating the nodules. In addition, radiofrequency ablation is also a treatment option, but it is not recommended for nodules close to large blood vessels in the lungs. All of the above medications should be used under the guidance of a doctor, do not self-medication, and the specific pathology of lung nodules need to go to the hospital for formal examination to confirm the diagnosis.