In our bodies there are millions of cells. Normal cells grow, divide and die. The process goes on as long as we live. In infancy or childhood normal cells divide and grow more quickly to help growth. When a person has become an adult then most normal cells will divide to replace dead sell or to help the healing process.
Cancer begins when cells in our bodies grow out of ocntrol. Almost all the cancer begins from the growth of abnormal cells. The growth of cancer cells differ from normal cell growth. Cancer cells continue to grow and become abnormal cells, besides that cancer cells can also invade and attack other tissues and then make a cell a cancer cell. Normal cells are not like that.
Cells become cancer cells because of damage to DNA. DNA is in every cell and directs all his actions. In a normal cell, when DNA is damaged the cell or repairing the damage or the cell dies. In cancer cells, DNA damage is not repaired, but cell will not die as expected. Instead, the cell will continue to make new cells that the body is unnecessary. The new cells all have the same DNA as the first cell is broken.
Person’s can have DNA damage occur due to heredity. But most of the DNA damage occurs during normal cell reproduction, or due to environmental factors such as smoking, drug use is exaggerated or other factors. Many factors can cause DNA damage.
most frequently encountered cases of cancer cells forming tumors. But some cancers such as leukemia, attack involving blood and blood forming organs and developed through other tissues around them grow.
Cancer cells often travel to other parts of the body where they begin to grow and form new tumors that replace normal tissue. This process is called metastasis. Happens when cancer cells enter the bloodstream or lymphatic vessels of our body.
No matter whether a lung can spread, it is always the name of the place where he started. For example, breast cancer spreads to liver is still called breast cancer, not liver cancer. Similarly, prostate cancer spread to bone and Metastatic prostate cancer, not bone cancer.
Many types of cancer can behave very different. For example, lung cancer and breast cancer are very different diseases. They grow at different rates and respond to different treatments. This is why people with cancer need treatment that is aimed at their particular kind of cancer.
Not all tumors are cancer. The tumors are benign tumors is not known. Benign tumors can cause problems – that might be enormous and the press organs and healthy tissue. But they can not (invade) other tissue. Why not invade, but can spread to other parts of the body (metastasis). These tumors are rarely life threatening
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