Here are some of the reasons why cells undergo mitosis: 1. to restore dying cells - mitosis is the division of cells in order to create new ones, and to replace these cells that are likely to disappear very soon. 2. to repair damaged cells - cells divide themselves in order to help other cells that are not doing so well. 3. to reproduce - mitosis is the way that cells reproduce and create their own "offspring" in order to repopulate.
