Question

How does cancer happens?

Answer 1

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.
REASONSandCAUSES:
Cancer starts when cells in a part of the body start to grow out of control. Cancer cell growth is different from normal cell growth. Instead of dying, cancer cells continue to grow and form new, abnormal cells.
The genetic material (DNA) of a cell start producing mutations that affect normal cell growth and division by being damaged. When this happens, sometimes these cells do not die but form a mass of tissue called a tumor. Cancer cells can also invade (grow into) other tissues, something that normal cells can't do.
Some viruses and bacteria are linked to certain cancers. For example, human papillomavirus (HPV) causes cervical cancer. Mutations accumulate, being another reason that cancer is found more often in older people.