- Cancer starts just by 1 cell growing at a high speed and multiplying too much.
- Due to the amount of growth, it turns into a tumour
- Only an issue if it applies pressure on nearby tissues, one example would be the brain.
Here's the difference between healthy cell division and cancer cell division.
A healthy cell can become cancerous. It doesn't happen overnight, but over a period of time. The behavior gradually changes, and as a result, anywhere from 300-700 cells become damaged. Those cells control division, cell growth, and lifespan.
In metastasis, cancer cells break away from where they were first formed (primary cancer), travel through the blood or lymph system, which forms new tumors.