A 0.5cm nodule in the lungs is usually not particularly important and is a benign nodule that may be related to a lung infection. The severity of lung nodules is related to the size of the nodule. The larger the lung nodule, the higher the degree of malignancy will be, in which the nodule less than 7mm is the lung’s micro-nodule, so 0.5cm nodule belongs to the lung micro-nodule, usually is not particularly serious, may be due to infection, as long as the follow-up observation can be. However, this is not absolute, if the examination found that the shape of the nodule is not too regular, the edge of the lobulated, then it indicates that the degree of malignancy is relatively high, you need to go to the hospital in a timely manner to carry out further examination to identify the cause of the disease, and then under the guidance of the doctor for the cause of the treatment. In normal times, patients should develop healthy living and eating habits, go to bed early and get up early, try not to stay up late, and maintain an optimistic mindset, so as not to make the nodules bigger.