Do people get hurt?
Oddly enough not very often. More people get hurt playing basketball than doing martial arts in Indiana every year. There is always the potential for injury but if the instructor is qualified and you have the protective equipment needed, you should never be injured.
Having said that,
a bruise or two does not count. You will get those from time to time,
sore muscles, and an aching joint now and then. You are learning to
fight. To do that for real, you will have to have controlled fights.
This is not to be feared and most students complain that Sensei dose
not let them do this enough, rest assured to promote learning, skill,
and safety; they do it the correct amount of time.