lung cancer causes, symptoms, treatment & survival rate

Lung cancer is a disease of uncontrolled cell growth in tissue of the lung. Lung cancer is the common cause of cancer related death in men and second most common in women. The main types of lung cancer are small cell lung carcinoma and non small cell lung carcinoma.

What is lung cancer?

Lung cancer means uncontrolled growth of abnormal cell which start off one or both lung. This abnormal cell do not develop into the develop into the healthy lung tissue but they rapidly multiply and form tumors. When tumors become large and more numerous, they destabilize the lungs ability to provide bloodstream with oxygen. Tumors that do not spread other place and remain in one place are known as benign tumors.

Malignant tumors are more dangerous than benign tumors because it can spread other part of the body either through the bloodstream or lymphatic system. When cancer spreads other part of the body from its origin, it refers to metastasis.

Primary lung cancer that originate into the lung but secondary lung cancer starts somewhere else in the body, then it metastasize that finally reach in the lung.

Causes of lung cancer

Major causes of lung cancer are including:


The lung cancer is strongly related with cigarette smoking. In about ninety percent of lung cancers is arising due to tobacco use. The risk of lung cancer is increase with the amount of cigarettes smoked and the period over which smoking has occurred. This is referring to this risk in term of pack-year smoking history. Pack year means number of packs of cigarette smoked per day is multiplied by the number of year smoked.

Pipe and cigar smoker also have a chance to lung cancer. But the risk is not as high as like cigarette smoking. A person who smoke one pack of cigarette per day, has a risk of developing lung cancer that is 25 time higher than a nonsmoker person. Pile and cigar smoker also have a risk of lung cancer about 5 times higher than a nonsmoker.

Passive smoking

Passive smoking mans the inhalation of tobacco smoke by the smoker. It is also a risk factor to develop lung cancer. Nonsmokers, who reside with a smoker, have a twenty four percent in risk for developing of lung cancer. It compare with nonsmoker who do not reside with a smoker. In U.S about 3000 lung cancer death occur due to passive smoking.

Radon gas

It is another major cause of lung cancer. Radon gas is a chemically inert gas that is decay product of uranium. Uranium decays to form radon that emits a type of ionizing reaction. Radon gas is a causes og lung cancer, about 12% of lung cancer death due to radon gas. In U.S making radon is the second major causes of lung cancer. This radon gas can travel up through soil and it can enter home though the gap of foundation or pipe.


Carcinogens like radiation, arsenic, tobacco, X-ray, the sun, gamma ray, asbestos are directly responsible to damage DNA and aid cancer. When our bodies are expose those carcinogens, that time free radical are formed that try to steal electrons from further molecule in the body. This free radical is responsible for damage cell and also affected their function.

Air pollution

It is another major cause of lung cancer. Air pollution from industry, vehicles, and power plan that can raise the likelihood of developing lung cancer. More than one percent of lung cancer deaths are attributable to berating populated air.

General symptoms of lung cancer

General symptoms of lung cancer are including:

Lung cancer symptoms are given below:

  1. Weight loss.
  2. Fatigue.
  3. Tiredness.
  4. Having caught most of the time.
  5. Short of breath.
  6. Pain during breathing.
  7. Headaches, bone or joint pain.
  8. Bleeding.
  9. Blood clots.
  10. Muscle wasting.

Less common symptoms of lung cancer:

  1. Pain under your ribs on your right side.
  2. Hoarse voice.
  3. Changes the shape of finger.
  4. Swelling in the neck.
  5. Pain in the chest, shoulder, or back unrelated to pain from coughing.
  6. Coughing up phlegm or mucus, especially if it is tinged with blood.
  7. A change in color or volume of sputum.

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