What causes cancer? 20. What are the factors that cause cancer?

Mainly because of the decrease in immunity. Cancer is actually an immunodeficiency disease, in fact, everyone has tumor cells in the body, it is just a matter of how many. When the body's immune cells recognize the tumour cells, they eliminate them.

Once a person's immune function is weakened, then it is unable to kill the tumor cells, so that the tumor cells grow, and then cancer. Cancer generally has an incubation period, which is generally difficult to detect in the early stage, with almost no symptoms, and when it is found, it is generally in the middle and advanced stages, so it is recommended to have regular examinations, so that it can also be detected early and early**. The longer you delay**, the lower your chances.

ps: This is all I typed one word by one, I hope lz can! There is no merit and hard work!

Thank you. Hope mine can be helpful to you.

There are many reasons why a person gets cancer. The most fundamental reason is that there is a mutation in the gene. After the occurrence of various factors, it is not corrected in time, so it develops into cancer.

Normal people have cells that mutate every day, but normal immune function can recognize the mutated cells and kill them. There are also genetic mutations that cause cells to "commit suicide", so most people do not develop tumors.

To put it simply, either the factors that cause the mutation have increased, or the repair or monitoring mechanism has decreased. Some of these are due to genetic factors, some are caused by environmental pollution, lifestyle and other causes of decreased immunity, or induced genetic mutations.

The only country in the world that is cancer-free is Fiji. The people on the island have a very healthy lifestyle, it is the only country in the world without cancer, cancer has become the first killer of human health, but it does not exist here, the average life expectancy of people here is very long, it is very suitable for play and retirement, in fact, the high incidence of cancer is inseparable from human eating habits, Fijian people especially like to eat anti-cancer food, some nuts and fruits are loved by the locals.

Fiji Information Note

The Republic of Fiji is a Pacific island country located in the South Pacific Ocean, east of Vanuatu, west of Tonga, and south of Tuvalu. It consists of 332 islands, of which 106 are inhabited.

Most of the volcanic islands surrounded by coral reefs include Viti Levu and Vanua. It has a tropical maritime climate and is often hit by hurricanes. The average annual temperature is 22 to 30.

It has been inhabited since 1500 BC. In 1643, the Dutch navigator Abel Yansson-Tasman first came to Fiji. In the nineteenth century, Europeans began to move in. It became a British colony in 1874.

Personal and contextual.

A Zheng quietly carryed, personal including psychological factors and physical factors.

Psychological factors: pessimistic, negative, depressed, and depressed people are more likely to suffer;

Physical factors: unhealthy diet, irregular work and rest, unreasonable exercise, poor personal hygiene, etc.;

Second, the general environment includes the living environment and diet.

Environment: living environment, air pollution, water pollution, etc.;

Living environment: poor hygiene, formaldehyde, etc.;

Diet: genetically modified, processing, planting, transporting aging substances, various additives;

There is also a lack of awareness and attention to health in human beings.

These are all important factors in the development of cancer.

Scientific studies have shown that smoking, drinking, staying up late and other behaviors may increase the risk of cancer. Smoking is one of the most important cancer risk factors in humans, and many types of cancer are associated with smoking. Alcohol consumption is also considered to be one of the important risk factors that are closely related to the increased risk of cancer, and excessive alcohol consumption can increase the risk of cancers such as breast, esophageal, and oral cancers.

Staying up late will affect your health, damage the immune system, and may lead to the occurrence of cancer. Overnight meals contain too many bacteria and high concentrations of nitrites, which can be harmful to the human body, but do not necessarily cause cancer. In conclusion, healthy lifestyle habits and environment play an important role in cancer prevention.

There are many types of cancer, such as liver cancer, food contamination with Aspergillus flavus, hepatitis B virus infection, and alcohol abuse.

Esophageal cancer, lack of vitamin A, vitamin C and vitamin E. Lack of certain trace elements, such as molybdenum, zinc, magnesium, selenium, etc. Eat pickled and moldy foods. Drinking alcohol and smoking will significantly increase the incidence of esophageal cancer.

Stomach cancer, delicious smoked and grilled food, high nitrate and nitrite content in drinking water and grains. Likes to eat pickled foods. Eat moldy food and drink alcohol.

Colon and rectal cancer, High-fat diet, insufficient dietary fiber, Other factors.

Many data on other cancers have proved that a diet with the highest number of fat and calories is positively correlated with the occurrence of breast cancer, and lung cancer patients are often deficient in vitamin A and selenium. High-fat diets have been reported to be associated with the development of endometrial, ovarian, prostate, and gallbladder cancers. Laryngeal cancer and oral cancer are associated with smoking and alcohol abuse, thyroid cancer is associated with dietary iodine deficiency, and nasopharyngeal cancer is associated with contamination with nitrosylated contents (such as nitrosamines) in the diet.