Lung cancer is a disease characterize by uncontrolled cells that are growing in tissues of the lung. A person gets infected by smoking too much also people who are non-smokers get lung cancer. Scientist are not sure why they get lung cancer even if they never ever smoked. If its untreated, the growth can spread beyond the lung in a process called metastasis into nearby tissue and, eventually, into other parts of the body. Most cancers that start in the lung, known as primary cancers, are carcinomas that derive from epithelial cells. The main types of lung cancer are small-cell lung carcinoma, also called oat cell cancer, and non-small-cell carcinoma. The most common cause of lung cancer is long-term exposure to tobacco smoke, which causes 80-90% of lung cancers. Nonsmokers account for 10-15% of lung cancer cases, and these cases are often attributed to a combination of genetic factors, radon gas, asbestos, and air pollution including secondhand smoke. [pic]
The most common symptoms are coughing(including coughing out blood), weight loss and shortness of breath. Other symptoms are: chest pain, bone pain, clubbing of the fingernails, fever, fatigue, superior vena cava obstruction, dysphagia(difficulty to swallow), and wheezing. If cancer grows in the airway, it may obstruct airflow, causing breathing difficulties. The obstruction can lead to accumulation of secretions behind the blockage, and predispose to pneumonia.
Dependingon the type of tumor, so-called paraneoplastic phenomena may initially attract attention to the disease. In lung cancer, these phenomenamay include Lambert-Eaton myasthenic syndrome
Symptoms of Lung cancer
*dyspnea(shortness of breath)