Cancer is a group of diseases characterized by the growth of abnormal cells that divide uncontrollably. These cells can invade and damage healthy tissue and spread to other parts of the body.

Cancer is the second leading cause of death. However, advances in early detection, treatment and prevention have improved survival rates for many types of cancer.

Symptoms
Cancer symptoms vary depending on where it occurs, but some common signs (not exclusive to cancer) include:

Unexplained fatigue
A lump or thickened area under the skin
Weight change (gain or loss) without trying
Skin changes, such as yellowing, redness or darkening; wounds that do not heal; or changes in an existing mole