Generally speaking, lung nodules will not cause back pain. Lung nodules are rounded or rounded high-density shadows seen on chest radiographs or CT of the lungs, and those less than 3cm are called nodules, and if they are larger than 3cm, they are called masses. General lung nodules will not have symptoms, will not cause back pain, back pain common causes are as follows: 1, respiratory diseases: the most common is the lung infection spread to the pleura, can cause back pain, with coughing and breathing, back pain will be aggravated, or directly is the pleurisy, will also cause back pain, with breathing and coughing, this pain will be aggravated. 2, cardiovascular system diseases: Such as angina or myocardial infarction, etc., can cause back pain, this is extremely critical, must immediately consult a doctor.