What Is Cancer?

The video explains that the human body consists of 50 to 75 trillion cells, which have varying lifespans. Cancer can develop when a single cell begins to grow uncontrollably, forming a tumor. This process is often triggered by mutations in the DNA, which can be caused by natural processes or external factors like smoking and radiation. While many mutations are harmless, some can lead to excessive cell division. The video also highlights the role of genes, such as BRCA1 and BRCA2, in inherited cancer risk. Overall, cancer is a non-communicable disease resulting from DNA changes that lead to uncontrolled cell growth.

What is the significance of the primary tumor in cancer development?

Describe the factors that can trigger mutations in cells.