Cancer is the uncontrolled growth of mutated cells in the body. The main cause of lung cancer is cigarette smoking, but pollution, radiation, and asbestos may also increase the risk. Symptoms of lung cancer include chest pain, coughing, weight loss, fatigue, and shortness of breath. Doctors diagnose lung cancer using tests like chest x-rays, CT scans, biopsies, and blood tests. Treatments include surgery, chemotherapy, radiation therapy, and targeted drug therapies. Researchers are exploring new treatments like Hsp90 inhibitors and CXCR4 inhibition to combat lung cancer.