what is cancer? and how is it formed
Answers
Explanation:
Cancer develops when the body's normal control mechanism stops working. Old cells do not die and instead grow out of control, forming new, abnormal cells. These extra cells may form a mass of tissue, called a tumor. Some cancers, such as leukemia, do not form tumors
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Cancer is a disease that starts in our cells. Our bodies are made up of millions of cells, grouped together to form organs or tissues such as the lungs, the liver, muscles and bones. Genes inside each cell order it to grow, work, reproduce and die. Normally these orders are clear, our cells obey and we remain healthy.
Sometimes a cell’s instructions get muddled and it grows abnormally. After a while, groups of abnormal cells form lumps or tumors.
If the abnormal cells stay in one place in the body, the tumour is benign. Benign tumours are not usually life-threatening.
Sometimes abnormal cells invade the tissues around then and spread to other parts of the body. When this happens, the tumour is malignant and the person has cancer. Tumour cells that spread to other parts of the body are called metastases.
Often, the first sign that a malignant tumour has spread is the swelling of near by lymph nodes, but cancer can metastasise to almost any part of the body. A malignant tumour can be dangerous and it is important to find it and treat it quickly, before it spreads.
Cancers are named after the part of the body where they start.
For example :- cancer that starts in the colon but spreads to the liver is called colon with liver metastases.
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