What is Lung Cancer?


Big Cell Lung Cancer | Small Cell Lung Cancer | Causes

It’s cancer that starts in your lungs & can spread to other parts of your body. Although it’s the top cause of cancer deaths for United States women & men, it’s also one of the most preventable kinds, by not smoking & avoiding other people’s secondhand smoke.

The disease mostly always starts in the spongy, pinkish-gray walls of the lungs’ airways which called bronchi or bronchioles or air sacs (called alveoli). There are more than 20kinds. The two main types are Big cell lung cancer & small-cell lung cancer. At 1st, you may not have any symptoms.

Big Cell Lung Cancer

Adenocarcinoma is the most common kind of this. It makes up 40 percentage of all lung cancer cases. It mainly happens in people who smoke or who used to & it’s also the No. 1 type of lung cancer among non-smokers.

More women get it than men. People with this type tend to be much younger than those with other kinds.  Adenocarcinoma can spread to the lymph bones, nodes, or other organs such as the liver.

Squamous cell carcinoma normally starts in the lung’s largest branches, which doctors call the “central bronchi.”    

This type accounts for 30 percent of lung cancers, & it’s more common in men & people who smoke. It may form a cavity within the tumor. It often involves the larger airways. It may make you cough up some blood. Squamous cell carcinoma can also spread to the lymph nodes, bones, & other organs such as the liver. 

Large cell carcinomas are a group of the cancers with the large cells that tend to start along the lungs’ outer edges. They are rarer than adenocarcinoma or squamous cell carcinoma, making up 10 percent to 15 percent of lung cancers. This type of tumor can grow faster & often spreads to nearby lymph nodes & distant parts of the body.

Small Cell Lung Cancer

It is the most aggressive form of the disease. It’s usually start in the lungs’ large, central bronchi. Almost all people who get it are smokers. It spreads quickly, often before symptoms appear. Many times, it spreads to the liver, bone, & brain.

The outlook for someone with lung cancer depends on a lot of things, including what type they have, their overall health, & how advanced the disease is when doctors find it.


Smoking is the biggest reason. It’s responsible for about 85 percent of all cases.

Quitting cuts, the risk. Former smokers are still slightly more likely to get it than the nonsmokers. There are also other reasons. Some genetic glitches may put many people at higher risk.  Secondhand tobacco smoke is also a cause. People who live with anyone who smokes are 20 percent to 30 percent more likely to get lung cancer than those who live in a smoke-free home.

Some other chemicals are risky, too. People who work with the asbestos or are exposed to the uranium dust or the radioactive gas radon are more likely to get the lung cancer, especially if they smoke.

Lung tissue which was scarred by the infection or disease, such as tuberculosis or scleroderma, becomes at risk for tumors in that tissue. Doctors call this a scar carcinoma. Many researchers think that diet may also influence your risk. But that’s not clear yet.

Categories: Disease

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