The etiology of lung cancer _ what is caused by lung cancer - how is lung cancer?

Risk factors can be divided into two types, such as smoking to avoid or changing risk factors such as genetic, age is inevitable or changed.

Risk factors that can avoid or change

Smoke

    Smoking is the main risk factor of lung cancer, about 80% of lung cancer deaths are considered to be caused by smoking. The risk of smokers suffering from lung cancer is more than 10 times higher than that of non-smokers. The longer the smoking time, the more smoking the smoked daily, the higher the risk. Other types of cigarettes such as cigars or low-coke cigarettes lead to the risk of lung cancer is not less than ordinary cigarettes, and the mint smoke is more harmful than ordinary cigarettes, and the mint can make smokers overhavened. Second-hand smoke also increases the risk of cancer.

Radon gas

    Helium is the second largest risk factor of lung, which is the main reason for non-smokers' lung cancer, but it is very strange to most people. Is a naturally occurring radioactive gas, which is from uranium in the soil and rock, countless taste, after being sucked in the respiratory tract, slowly accumulating a radio source, continuous radiation lungs. In the atmosphere, there is very little in the atmosphere, which will not lead to lung cancer, but in the room, due to the ratio of the radon weighs 7.5 times, it will be deposited indoors, especially the basement. Can also dissolve in the water, and the water is generally from the surface water, so there is very little content. Groundwater, such as water wells, hot springs and other spirits are higher, and the radon will be disseminated from the water from the water, so the open-air hot spring is better than the indoor hot spring.

working environment

    Asbestos often contains in building materials, asbestos itself is not harmful, but the asbestos fiber is very small, it will deposit in the lungs after inhalation, damage the lung tissue causes cancer, so workers working in the construction industry in the cotton mine, construction industry High risk factors. In addition, recognized carcinogenic industrial chemicals include:

Radioactive substances such as uranium, radium, etc.

Other chemicals such as arsenic, beryllium, cadmium, silicon, vinyl chloride, nickel compound, chromium compound, coal product, mustard, and chlorofin, etc.

Diesel engine exhaust gas.

Vitamins

    Two large studies have found that smokers taking β-carotene supplements actually increase the risk of lung cancer.

Hazardous factors inevitable or changed

Lung radiotherapy history

    For patients with chest radiotherapy history of other cancers, there is a high risk of lung cancer, such as patients with radiation therapy.

Air pollution

    Air pollution (including PM2.5) is slightly increased lung cancer risk, which is why urban lung cancer is more than rural areas, but this risk is far less than the risk caused by smoking, the researcher estimates that there are about 5% of lung cancer in the world. It may be due to outdoor air pollution.

Family history (inherited).

    If there is a straight relatives suffering from lung cancer, especially when you are young, you will be sick, and the risk of cancer will increase.

Risk factors that are not clearly certified

Visible marijuana

    Since marijuana contains many carcinogens such as tar, it may increase the risk of lung cancer.

talcum powder

    Talc is a mineral, and its natural form may contain asbestos. All household products (such as baby, body, facial) have now been stipulated, have not been specified. Related news has a strong baby talcum powder incident.