Almost everyone in this world is aware of the word “cancer”. For most people this word implies fear, pain, and death. However, although most of us have used this word in our conversation, not many of us are actually aware of what it is exactly. This hub is an attempt to explain what cancer is and how it develops.

Cancer begins in cells
The first thing we need to understand is that our body is made up of many types of cells. Cells are the basic unit of life and they are constantly growing, dividing, and dying. This process is necessary for our body to grow and for it to keep healthy. In our growing years, these cells divide much faster which helps our body grow. But when we become adults, these cells will mostly divide to replace old and dying cells or to repair any injuries which might have occurred. Cells are where cancer begins.

Cancer cells are different from normal cells
The process of cells dying and being replaced by new ones is normal. However, cancer cells are different from normal cells. A normal cell becomes cancerous when the genetic material or DNA present in it gets damaged, the cell is unable to repair it, and instead of dying it continues to grow and divide. The body does not need these cells and all the new cells have the same damaged genetic material as the first cell.

Cancer cells mostly form a tumor
When damaged cells keep on multiplying, the result is usually a mass or growth or a tumor. These tumors can either be benign (non-cancerous) or malignant (cancerous). The cells present in malignant tumors can invade the neighboring tissues and organs. These cancer cells can also enter the bloodstream or lymph vessels of the body and spread to other parts. This process is called metastasis.

Most cancers develop in this way
Most of the cancers known to us develop in the manner mentioned above. However, some cancers such as leukemia (which involves the blood and blood-forming organs) may or may not form tumors. Cancers get their name from the organ or type of cells of the body where they originate. All types of cancers are different. They grow differently. And they all require different treatments.

Sometimes people can inherit cells with damaged DNA. But mostly, cancers are caused due to something in our environment. Often there is no known cause. Whatever may be the reason for cancer, the fact is that it is one of the leading causes of death around the world. Early diagnosis and regular treatment can help kill the cancerous cells, control their further growth, and save a person’s life.

For more information on cancer, please visit:
National Cancer Institute
American Cancer Society