Lung Cancer :
Lung cancer is most common malignant cancer in world. Lung cancer can be of various types ie,. small cell lung cancer (SCLC) aggressive type, non small cell lung cancer, carcinoid lung tumor, adeno carcinooma, squamous cell carcinoma etc. Risk factors include cigarette smoking (80-90%) of the cases, secondhand smoke , genetic preponderate, asbestos exposure in workers , radon exposure etc. Signs and symptoms include persistent cough that doesn't relieve with OTC drugs, chest pain, shortness of breath, weight loss, weakness, blood in cough, wheezing etc. Most of the cases of lung caner are diagnosed in the late stages due to vague symptoms but aggressive treatment is necessary to increase the chances of survival.