Lung cancer is one of the most common cancers in the world. It is the leading cause of cancer death among men and women in the United States. Cigarette smoking causes most lung cancers. A greater number of cigarettes they smoke daily newspapers and the younger you start smoking, the greater the risk of developing lung cancer. Exposure to high levels of pollution, radiation and asbestos can also increase the risk.
Common symptoms of lung cancer include:
- A cough that does not go away and worsens over time
- Constant chest pain
- Cough with bloody sputum
- Shortness of breath, wheezing or hoarseness
- Repeated problems with pneumonia or bronchitis
The risk of cancer has changed over time. Some cancers that were once common have become rare. For example, 60 years ago in some countries, 
One of the main problems of 
What if you never smoked? eat as directed. ‘can also save from 
Lung cancer occurs when there is an unusual growth of cells in the lung tissue growth, usually malignant, metastasis and proliferation may lead to other body tissues. This 
Mainly, there are three types of 
Symptoms
