The causes of 5mm lung nodules may be inflammatory, scarring, congenital and early lung cancer, which can be treated by regular follow-up and surgery if necessary. 1. Regular follow-up: 5mm lung nodules are benign lesions in most cases, and generally do not need special treatment, but can be reviewed regularly to observe the changes in the size of the nodules. 5mm lung nodules are generally small nodules, which are clinically less harmful, and regular follow-up is sufficient. 2. Surgery: If the lung nodule shows a trend of slow growth over a long period of time, and the relevant examination highly suspects that it is a malignant nodule, it can be surgically resected to achieve curative effects. If you find 5mm lung nodules, you can seek medical treatment and follow up regularly.