Cancer
In short
A group of diseases where cells grow out of control and can spread to other parts of the body. These cells often form tumours that can be malignant or benign.
In plain words
Normally, our cells grow and divide in an orderly way. In cancer, this process breaks down, and cells multiply too fast. These extra cells can build up into lumps or damage healthy organs.
A simple example
A person might develop a tumour in their lungs because damaged cells began dividing rapidly. If these cells move to the liver, the cancer has spread.
Why it matters
It is a leading cause of death worldwide. Understanding risk factors like smoking, diet, and exercise helps in prevention and early detection.
Easy to mix up
Do not confuse cancer with a benign tumour, which grows in one place but does not invade other tissues.