Lung cancer is the second most common cancer in the world (after skin cancer) and it causes most of the death of cancer. It affects mostly people aged between the ages of fifty and seventy.

The disease can be prevented to a large extent _ as the main factor is smoking, in the past; lung cancer was always more common among men but the gap has narrowed in recent years, because of the increased numbers of smokers women. Also, people who spend a lot of time in an atmosphere redolent with smoke - such as people working in bars for example - are also susceptible to the risk of lung cancer due to passive smoking.

Signs and symptoms:

• Chronic cough (continuous), has sometimes sputum (phlegm) overprinted with blood.

• Shortness of breath.

• An unexplained loss of weight.

• Pain in the chest.

• Wheezing.

• Symptoms of bronchitis or pneumonia.

And some forms of lung cancer is without symptoms until fully matures.

Lung cancer can be formed very slowly, symptoms may take many years to appear, in addition to that, there are types of lung cancer that do not cause any symptoms until the final stages. As a result, it cannot be diagnosed as lung cancer until it get worse and treatment options become limited.

There are three options for treatment and determine the nature of each cancer and the extent exacerbated:

• Surgery: You can remove the tumor by surgery only if the cancer has not spread to other organs, if there was no spread, the surgeons and the removal of one entire lung or a large part of it.

• Chemotherapy: following surgery is usually chemotherapy, to eradicate the tumor; this type of treatment is also used to target tumors, too.

• Radiation Therapy: This treatment slows down tumor growth but does not destroy it completely, which is often used to treat tumors of micro - known as Metastases that have spread from the lungs to the brain, bone and liver.