Whether or not a 9 x 10 mm nodule in the chest is serious is determined by the condition of the nodule. Malignant nodules are serious conditions; benign nodules are relatively less serious. 1. Malignant nodule: the corresponding nodule is irregular in shape, the edge is not smooth, and malignant signs such as burr, lobulation, pleural pulling and vacuoles can be seen, which is a relatively serious condition, and it will seriously affect the physical condition if not controlled in time. 2. Benign nodules: the edges of the corresponding nodules are smooth, there is no obvious invasion of the surrounding tissues, some of the nodules have obvious coarse calcification, the corresponding nodules mainly include lung cysts, sclerosing hemangiomas and misshapen tumors, etc., which do not belong to the particularly serious conditions, and can be reviewed first. If the nodules in the lungs are found to have obvious signs of malignancy, it is necessary to consult a doctor in time for observation, puncture biopsy if necessary, and carry out standardized treatment under the guidance of clinicians to avoid delaying the condition.