I would probably say it's most likely growing pains. If she is sexually active, it is also possible she is pregnant or having side effects from birth control, since many forms prevent pregnancy by tricking the body into thinking it is already pregnant. If you believe it is a medical illness, have her speak with her OB/GYN (I assume by this age she already has one she's seeing for PAPs and whatnot?), and they can examine her more closely. Also, keep in mind that at that age, she is considered an adult, and needs to be treated with respect and understanding, or else you may find yourself less informed and even more worried than necessary.
It is not uncommon for people who are not trained in medicine to not know the proper spelling for an illness or condition. Most people who do are familiar with it, because they happen to know someone who has experienced it or thought they might be showing possible symptoms. Give people a break.
at 11:21 PM on Aug. 14, 2010