We will be talking about these 3 most common types of cancer.Let’s start with lung cancer:

Lung cancer forms in cells of the lung. The lungs are located in the chest on either side of the heart. The right lung has three main sections, called lobes. The left lung, a little smaller, has two:. The lungs are lined with a thin protective membrane called the pleura. It consists of two layers of fabric or 'sticky' one covering the lung surface and the other along the inside wall of the chest cavity. A small amount of fluid (pleural fluid) is trapped between two layers of the pleura.

The lungs are involved in breathing. The air inhaled through the nose and throat down the length of the trachea. The trachea divides at its extremity into two ducts, the left and right bronchi, which carry air to each lung. Inside the lungs, bronchi divide into ducts becoming smaller and then take the name of the bronchioles. Each bronchiole ends in a cluster of tiny air sacs, called alveoli. The role of the cells is to capture oxygen from the air we breathe to pass the blood, which then circulates in all parts of the body. These are also the cells that remove carbon dioxide from the blood, which is expelled from the lungs during expiration.

There are two main types of lung cancer:

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Lung cancer is non small cell form of lung cancer the most common. It develops more slowly than small lung cancer cells.
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The small lung cancer cells grow rapidly and often spreads to other parts of the body.

Each type of lung cancer evolving specifically, the treatment will be different depending on the case.

A rare form of cancer, mesothelioma, is often mistakenly called lung cancer. Pleural mesothelioma starts in the pleura, but it is a very different illness from cancer forming in the lung.

A diagram showing parts of the respiratory system

A rare form of cancer, mesothelioma, is often mistakenly called lung cancer. Pleural mesothelioma starts in the pleura, but it is a very different illness from cancer forming in the lung.

Smoking is the leading cause of lung cancer. People who live or work with smokers are also at increased risk because of their exposure to secondhand smoke.

Other factors that increase the risk of lung cancer are:

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exposure to asbestos and other substances such as arsenic or drinking water containing high concentrations of arsenic, chromium and nickel, especially among smokers;
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exposure to radon gas;
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personal history of lung cancer;
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family history of lung cancer;
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pollution.

Lung cancer can sometimes grow in the absence of all these risk factors.

After checking your medical history and you have examined, your doctor may suspect the presence of lung cancer. To confirm the diagnosis, your doctor will use some analysis, which will also establish the "stage" of cancer