For a dog, bug bites can result in severe life threatening symptoms. Allergic reactions occur when the immune system produces antibodies that stimulate certain cells to produce chemicals. These chemicals cause the allergic reactions that are meant to protect the body from the intrusive bug bite.
Restrictive lung disease. Restrictive lung disease (chest wall diseases) can result from different problems, including interstitial fibrosis, scoliosis (spine curvature), and sarcoidosis. Some cause scarring in the lungs, while others compress the lungs. Some have no known cause; other causes include occupational exposure, chemotherapeutic agents or radiation, and connective tissue diseases such as lupus or rheumatoid arthritis.
Some causes of a lung mass include: 1  Lung cancer. 2  Other cancers â Some cancers that may appear as a mass in the lungs include lymphomas and sarcomas. 3  Benign (non-cancerous) lung tumors, such as hamartomas, which are the most common type of benign lung tumor.