Why Does Cancer Happen? Causes, Symptoms & Prevention Guide 2026
10/06/26 Author: K. Chishti Why Does Cancer Happen? Causes, Symptoms & Prevention Guide 2026 Introduction, Cancer is one of the most feared words in health. But fear comes from not knowing. In simple terms, cancer is not one disease but a group of 100+ diseases where body cells start growing out of control. Understanding why cancer happens and how it starts is the first step to prevention and early treatment. This guide explains everything in easy English. "Difference between normal cell and cancer cell medical diagram" How Does Cancer Actually Start? Our body is made of trillions of cells. Old cells die and new cells are made daily. This process is controlled by DNA - the instruction manual inside every cell. Sometimes DNA gets damaged. This damage is called a mutation. Most mutations are fixed by the body. But if mutation happens in the part of DNA that controls cell growth, the cell forgets how to stop. It keeps dividing again and again. This uncontrolled group of ce...