What Actually Happens When You Get Cancer - Explained

What Actually Happens When You Get Cancer - Explained What Cancer Actually Is (Explained Simply) You've heard the word a thousand times. But what is actually happening inside a cell when cancer starts? This video breaks down the real biology — step by step — from a single DNA copying error to a fully metastasized tumor. You'll learn: How a single mutation disables a cell's "stop dividing" signal Why your immune system doesn't always catch it (PD-L1 explained) How tumors build their own blood supply (angiogenesis) How cancer actually spreads to other organs (metastasis) Why chemo causes hair loss and nausea — and what it's really targeting What immunotherapy does differently No fear-mongering, no oversimplified metaphors — just the actual mechanism, explained clearly enough that you could explain it back. ⚠️ This video is for educational purposes only and is not medical advice. If you or someone you know is dealing with cancer, please consult a healthcare professional. #Cancer #Biology #ScienceExplained