Lung carcinoma is a malignant lung tumor characterized by uncontrolled cell growth in lung tissue that can spread to other organs. The main types are small cell lung cancer and non-small cell lung cancer (NSCLC), which includes adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. NSCLC accounts for 80-85% of cases and is linked to smoking. Diagnosis involves medical history, imaging tests like CT scans, and biopsies. Staging uses TNM classification and determines treatment options like surgery, chemotherapy, and radiation therapy.