It is difficult to determine how long it takes for 8mm solid lung nodules to become cancerous. Generally speaking, certain inflammatory nodules are self-absorbed and rarely become cancerous, and nodules caused by pulmonary fibrosis are not necessarily cancerous, with some becoming cancerous in as little as a few months or as long as decades. There are many causes of 8mm solid lung nodules, such as fungal infections, Mycobacterium tuberculosis infections, and some pulmonary sarcoidosis. Generally, fungal and Mycobacterium tuberculosis infections, after aggressive treatment, the nodules tend to shrink and some disappear on their own. Granulomatous nodules, although they will continue to grow in size, are generally not prone to cancer. Nodules caused by pulmonary fibrosis are not necessarily cancerous. Some pulmonary fibrosis mutates and becomes cancerous, but the duration varies from a few months to decades. Therefore, there is no precise answer as to whether a nodule is cancerous or not. Some nodules become smaller and smaller after self-absorption, while some gradually increase in size, which need to be alerted to the possibility of cancer, and therefore need to be reviewed regularly. Generally speaking, 8mm solid lung nodules need other tests to rule out cancer. If the nodule is non-cancerous, it is generally less likely to be cancerous.