Pregnancy does not usually cause lung nodules to grow. The causes of lung nodule growth include stimuli from the work environment and the living environment. The causes of lung nodules generally include lung tumors, tuberculosis and lung inflammation, etc. You need to go to a regular hospital for examination, which generally includes high-resolution CT examination of the lungs and X-ray examination to make a clear diagnosis. The growth of lung nodules is not related to pregnancy, but is generally considered to be related to the stimulation of the work and living environment, such as long-term smoking and second-hand smoke, which will lead to changes in the lung nodules due to stimulation. In addition, lung nodules can be harmful, and should be treated under the guidance of a specialist after diagnosis.