Yep, had them when I went to Kenya with Saints Foundation in 2010... no side effects at all.
Enjoy it. Stay open minded to anything you see that you don't like (poverty or treatment of people,etc) and remember that what is the 'norm' to you, may not be the 'norm' for them.
Yeah I've never really been anywhere too culturally shocking. I'm not really sure what to expect but looking forward to the experience.