Cancer- it´s causes
Pradeep Chauhan
April 17, 2008
What is cancer?
Cancer is a term used for diseases in which abnormal cells divide without control and are able to invade other tissues. Cancer cells can spread to other parts of the body through the blood and lymph systems.
Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for the organ or type of cell in which they start - for example, cancer that begins in the colon is called colon cancer; cancer that begins in basal cell of the skin is called basal cell carcinoma.
What causes cancer?
Cancer begins with damage (mutations) in your DNA. Your DNA is like a set of instructions for your cells, telling them how to grow and divide. Normal cells often develop mutations in their DNA, but they have the ability to repair most of these mutations. Or, if they can't make the repairs, the cells often die. However, certain mutations aren't repaired, causing the cells to grow and become cancerous. Mutations also cause cancer cells to live beyond a normal cell life span. This causes the cancerous cells to accumulate.
The initial genetic mutation is just the beginning of the process by which cancer develops. Scientists believe you need a number of changes within your cells in order to develop cancer, including:
An initiator to cause a genetic mutation. Sometimes you're born with this initial genetic mutation. Other times a genetic mutation is caused by forces within your body, such as hormones, viruses and chronic inflammation. Genetic mutations can also be caused by forces outside of your body, such as ultraviolet (UV) light from the sun or cancer-causing chemicals (carcinogens) in your environment.
Carcinogens
A 'carcinogen' is something that can help to cause cancer. Tobacco smoke is a powerful carcinogen. But not everyone who smokes gets lung cancer. So there must be other factors at work.
The immune system
People who have problems with their immune systems are more likely to get some forms of cancer. This group includes people who
Have had organ transplants and take drugs to suppress their immune systems to stop organ rejection
Have AIDS
Are born with rare medical syndromes which affect their immunity
The kinds of extra cancers that affect these groups of people fall into two, overlapping groups
Some kinds of cancer are caused by things people do. Smoking can cause cancers of the lungs, mouth, throat, bladder, kidneys and several other organs, as well as heart disease and stroke. While not everyone who smokes will get cancer, smoking increases a person's chance of getting the disease. Drinking a lot of alcohol has also been shown to increase a person's chance of getting cancer of the mouth, throat, and some other organs. This is especially true if the person drinks and smokes.
Cancer Risk Factors
What are cancer risk factors?
Growing older
Tobacco
Sunlight
Ionizing radiation
Certain chemicals and other substances
Some viruses and bacteria
Certain hormones
Family history of cancer
Alcohol
Poor diet, lack of physical activity, or being overweight
Ask Questions Share Answers Discussion Forum . Also read about Herbal Remedies Natural Cure Herbal Supplements and Natural Herbal Home Remedies Treatment
Cancer is a term used for diseases in which abnormal cells divide without control and are able to invade other tissues. Cancer cells can spread to other parts of the body through the blood and lymph systems.
Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for the organ or type of cell in which they start - for example, cancer that begins in the colon is called colon cancer; cancer that begins in basal cell of the skin is called basal cell carcinoma.
What causes cancer?
Cancer begins with damage (mutations) in your DNA. Your DNA is like a set of instructions for your cells, telling them how to grow and divide. Normal cells often develop mutations in their DNA, but they have the ability to repair most of these mutations. Or, if they can't make the repairs, the cells often die. However, certain mutations aren't repaired, causing the cells to grow and become cancerous. Mutations also cause cancer cells to live beyond a normal cell life span. This causes the cancerous cells to accumulate.
The initial genetic mutation is just the beginning of the process by which cancer develops. Scientists believe you need a number of changes within your cells in order to develop cancer, including:
An initiator to cause a genetic mutation. Sometimes you're born with this initial genetic mutation. Other times a genetic mutation is caused by forces within your body, such as hormones, viruses and chronic inflammation. Genetic mutations can also be caused by forces outside of your body, such as ultraviolet (UV) light from the sun or cancer-causing chemicals (carcinogens) in your environment.
Carcinogens
A 'carcinogen' is something that can help to cause cancer. Tobacco smoke is a powerful carcinogen. But not everyone who smokes gets lung cancer. So there must be other factors at work.
The immune system
People who have problems with their immune systems are more likely to get some forms of cancer. This group includes people who
Have had organ transplants and take drugs to suppress their immune systems to stop organ rejection
Have AIDS
Are born with rare medical syndromes which affect their immunity
The kinds of extra cancers that affect these groups of people fall into two, overlapping groups
Some kinds of cancer are caused by things people do. Smoking can cause cancers of the lungs, mouth, throat, bladder, kidneys and several other organs, as well as heart disease and stroke. While not everyone who smokes will get cancer, smoking increases a person's chance of getting the disease. Drinking a lot of alcohol has also been shown to increase a person's chance of getting cancer of the mouth, throat, and some other organs. This is especially true if the person drinks and smokes.
Cancer Risk Factors
What are cancer risk factors?
Growing older
Tobacco
Sunlight
Ionizing radiation
Certain chemicals and other substances
Some viruses and bacteria
Certain hormones
Family history of cancer
Alcohol
Poor diet, lack of physical activity, or being overweight
Ask Questions Share Answers Discussion Forum . Also read about Herbal Remedies Natural Cure Herbal Supplements and Natural Herbal Home Remedies Treatment