Non-small cell lung cancer (NSCLC) is the most common type of lung cancer, accounting for about 85% of all cases. It develops in the lungs and can spread to other parts of the body. NSCLC is typically categorized into three main subtypes: adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. Symptoms of NSCLC may include a persistent cough, chest pain, and difficulty breathing. Risk factors include smoking, exposure to secondhand smoke, and environmental pollutants. Early detection and treatment are crucial for improving outcomes, and options may include surgery, chemotherapy, and radiation therapy.