Cancer occurs when cells in a part of the body begin to grow out of control. Normal cells divide and grow in an orderly way. Cancer cells do not. Cancer cells keep growing and crowd out normal cells. There are many kinds of cancer. But they all have this out-of-control cell growth in common.

Lung Cancer is a disease in which certain lung cells don't function right, divide very fast, and produce too much tissue forming a Lung Tumor. The lungs, a pair of sponge-like, cone-shaped organs, are part of the body's respiratory system. When we breathe in, the lungs take in oxygen, which our cells need to live and carry out their normal functions. When we breathe out, the lungs get rid of carbon dioxide, which is a waste product of the body's cells. Lung Cancers that begin in the lungs are divided into the following two major types:

Non-small cell lung cancer 
Small cell lung cancer 

The type is determined by the way the cells look under a microscope. Each type of lung cancer grows and spreads in different ways and is treated differently. Another type of lung cancer is Adenocarcinoma. 

What Causes Lung Cancer? 

A risk factor is anything that increases a person's chance of getting a disease such as cancer. Different cancers have different risk factors. Some risk factors, such as smoking, can be controlled. Others, like a person's age or family history, can't be changed. Several factors can increase the risk of lung cancer. 

Smoking is by far the leading risk factor for lung cancer. Tobacco smoke causes more than 8 out of 10 cases of lung cancer. The longer a person has been smoking and the more packs per day smoked, the greater the risk. If a person stops smoking before lung cancer develops, the lung tissue slowly returns to normal. Stopping smoking at any age lowers the risk of lung cancer. 

Cigar and pipe smoking are almost as likely to cause lung cancer as is cigarette smoking. There is no evidence that smoking low tar cigarettes reduces the risk of lung cancer. 

People who donít smoke but who breathe the smoke of others also have a higher risk of lung cancer. Non-smoking spouses of smokers, for example, have a 30% greater risk of developing lung cancer than do spouses of nonsmokers. Workers exposed to tobacco smoke in the workplace are also more likely to get lung cancer. 

Hookah smoking has become popular among young people. Although there is less tobacco in the product used for hookahs, it is still dangerous and addictive. The ACS believes that people should avoid any amount of tobacco. 

Asbestos is another risk factor for lung cancer. People who work with asbestos have a higher risk of getting lung cancer. If they smoke as well, the risk is greatly increased. Although asbestos was used for many years, the government has now nearly stopped its use in the workplace and in home products. While it is still present in many buildings, it is not thought to be harmful as long as it is not released into the air. 

Another type of cancer linked to asbestos (mesothelioma) can start in the lining of the lung. The American Cancer Society has information about this type of cancer through our toll-free number or on our Web site. 

Radon is a radioactive gas made by the natural breakdown of uranium, which is found at higher than normal levels in the soil in some parts of the US. Radon canít be seen, tasted, or smelled. Radon can become concentrated indoors and create a possible risk for cancer. Smokers are especially sensitive to the effects of radon. State and local offices of the EPA (Environmental Protection Agency) can provide information about how to test for radon in the home. 

High radon levels in some mines can increase the lung cancer risk for miners. 

Cancer-causing agents in the workplace include the following: 
nickel chromates 
coal products 
mustard gas 
chloromethyl ethers 
diesel exhaust 

People who work with these substances should be very careful to avoid exposure as much as possible. 

Marijuana cigarettes have more tar than regular cigarettes. Many of the cancer-causing substances in tobacco are also found in marijuana. Marijuana is also inhaled very deeply and the smoke is held in the lungs for a long time. 

Medical reports suggest that marijuana could cause cancers of the mouth and throat. But because marijuana is an illegal substance it is not easy to gather information about its effects on the body. 

Radiation treatment to the lung: People who have had radiation to the chest to treat cancer are at higher risk for lung cancer, especially if they smoke. 

Other diseases such as tuberculosis (TB) and some types of pneumonia often leave scars on the lung. This scarring can increase the risk of developing lung cancer.People with diseases from breathing in certain minerals also have a higher risk of lung cancer. 

Personal and family history: If you have had lung cancer, you have a higher risk of getting another lung cancer. Brothers, sisters, and children of people who have had lung cancer may have a slightly higher risk themselves. 

Diet: Some reports suggest that a diet low in fruits and vegetables might increase the risk of lung cancer in people who are exposed to tobacco smoke. It may turn out that fruits and vegetables help protect against lung cancer. 

Air pollution: In some cities, air pollution may slightly increase the risk of lung cancer. But the risk is still far less than that caused by smoking. 

During the past few years, scientists have made great progress in understanding how risk factors produce certain changes in the DNA of lung cells, causing the cells to become cancerous. DNA is the genetic material that carries the instructions for nearly everything our cells do. 

Current research in this field is aimed at developing tests that can find lung cancers at an early stage by spotting DNA changes. But these tests are not yet ready for routine use. Therefore, doctors stress avoiding tobacco smoke and the other risk factors listed above.

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