Fast growing lung nodules are called growing nodules, and fast growing nodules depend on the cycle, if the lung nodule grows rapidly within 1 month it is mostly inflammatory changes. If the nodule grows relatively fast within 6 months or 1 year, with short burr, lobulated, pleural pull sign, pleural depression sign, etc., be highly alert that the lung nodule has undergone early lung cancer changes. Nodules that grow very fast in the short term are mostly inflammatory nodules, while nodules that grow faster from six months to more than one year are more likely to be considered tumorigenic nodules. To determine the lung nodules, it is necessary to further combine relevant examinations, especially high-resolution CT of the chest, enhanced CT of the chest and percutaneous lung aspiration pathology, to determine whether the nodules are benign or malignant at an early stage. In conclusion, a fast growing lung nodule is not necessarily a good thing and needs to be followed closely.