Do you lose all your hair during cancer?

I think it depends on what kinda of cancer you have and how you're being treated for it. Some radiation and chemo therapy can cause you to loose hair but everybodies different.

Cancer doesn't make you lose your hair, but the chemo does. The reason for this is that chemotherapy is the delivery of toxins that kill or damage the fastest growing cells in your body. Malignant cells grow and replicate super quickly, so the chemo is targetted at them, but hair folicles grow fast as well. So -- if the chemo is working -- almost everyone loses their hair at some point in the process.

The good news is that it grows back (and often it grows back curly!).