2 Answers

Lung nodules can be either benign (non-cancerous) or malignant (cancer). The most common causes of benign nodules include granulomas (clumps of inflamed tissue) and hamartomas (benign lung tumors). The most common cause of malignant lung nodules include lung cancer, or cancer from other regions of the body that has spread to the lungs (metastatic cancer). Lung nodules can be broken down into a few major categories: 

• Infections - This includes bacterial infections such as tuberculosis, fungal infections such ashistoplasmosis and coccidiomycosis, and parasitic infections such as ascariasis(roundworms).
  
  


• Inflammation - Conditions such as rheumatoid arthritis, sarcoidosis, and Wegener’s granulomatosis can cause lung nodules.
  
  


• Benign tumors - Benign lung tumors such as hamartomas can show up as a nodule in the lungs on x-ray.
  
  


• Malignant tumors – This includes lung cancer, lymphomas, and cancer that has spread to the lungs from other parts of the body, among others. 

http://lungcancer.about.com/od/symptoms/a/Lung-Nodules.htm

It is not cancer until the Dr. tells you it is cancer.  And whatever it is, worrying will not change it.  A positive attitude does wonders.  I had a brother who had cancer, and for 11 yrs. he would not let it get the best of him, he thought, the statistics are not 100 % in favor of death, so, I am one of those who will not die of cancer.