How does cancer and chemo make a person bald?

Some chemo therapy is designed at attack a specific type of cell replication. This is how cancer cells divide. So it is not targeting the cancer, per se, but targeting the way the cancer replicates, makes more cancer cells- spreads. So it is like attacking the verb instead of the noun. Stopping the replication, the spread, kills it and it falls back into tinier and tinier areas- until it disappears (hopefully). Unfortunately a lot of other types of cells in the body replicate in this way, similar to some cancer cells, so these cells get killed off also. But since they are healthy, normal cells, the body will heal and replace them. Hair follicle cells divide in this way, so they are destroyed and the hair falls out. One interesting thing, is when the hair starts to grow back it is the same as baby hair- verry soft- really beautiful to see it thickening and growing back. It takes several months before you will start to cut and style it again.

When someone has cancer,docters try to get rid of it
as soon as possible. And chemo is a very strong procedure
that kills almost every cell in your body.So it also tends to kill hair cells.
If a person goes bald from chemo they also tend to loose hair in other places as well as
there eyebrows, arms and legs.

Hope this helped.

The other answer is right. It destroys the hair cells and the follicle causing the hair to just fall out. Like the last answer not an expert but i have a slight knowledge of it.