Is radiation damaging to the health of humans? If so, in what way/ways?

My answer is: Yes, radiation though helpful in treating certain diseases is damaging to the health of human beings in many ways one of which being that it mutates our DNA and is unhealthy. It can also make people bald.

Is that true and if so are there any other ways that radiation can hurt people?

of course. The reason radiation helps cure diseases is that it kills the bad cells. Improperly administered, it also kills the good cells!