What is cancer

1. a disease caused by an uncontrolled division of abnormal cells in a part of the body."he's got cancer"
2. an evil or destructive practice or phenomenon that is hard to contain or eradicate."gambling is a cancer sweeping across the nation"synonymes : evil, blight, scourge, poison, canker, sickness, disease, pestilence, plague, rot, corruption

What exactly is cancer?

The Definition of Cancer\n\n Cancer is a disease in which some of the body's cells grow uncontrollably and spread to other parts of the body. Cancer can start almost anywhere in the human body, which is made up of trillions of cells.

What is the main cause of cancer?

Cancer is caused by changes (mutations) to the DNA within cells. The DNA inside a cell is packaged into a large number of individual genes, each of which contains a set of instructions telling the cell what functions to perform, as well as how to grow and divide.

What does cancer do to a person?

A cancer can grow into,or begin to push on nearby organs, blood vessels, and nerves. This pressure causes some of the signs and symptoms of cancer. A cancer may also cause symptoms like fever, extreme tiredness (fatigue), or weight loss. This may be because cancer cells use up much of the body's energy supply.