Lung nodule 22mm is not necessarily lung cancer, but relevant examination is needed to determine whether it is benign or malignant. Lung nodules are usually seen in inflammation and tuberculosis infection, and on CT, they have obvious boundaries, are clearly demarcated from surrounding tissues, and will not grow rapidly in a short period of time. They are usually benign and not serious, and can be cured by anti-infection and anti-tuberculosis treatment. However, further examination is needed to determine whether the nodules are benign or malignant. Usually, the examination of lung nodules includes chest CT, enhanced CT, magnetic resonance imaging (MRI), lung puncture biopsy, etc. If the edges of the nodules are rough and there are signs of lobulation, it is more likely that the nodules are lung cancerous or lung cancerous as confirmed by lung puncture biopsy. Therefore, when nodules are found in the lungs, it is necessary to go to the hospital for further examination to clarify the benign or malignant nature, and if it is lung cancer, it should be treated with surgery according to the specific situation, so as not to lead to the progression of the disease.