it depends on the person (im being completely honest based on my experiences and what doctors told me). i never had any problems with joint pain, but it is a possibility for some people. i think it more exaggerates existing joint pain, but if you are in good shape, it shouldnt be a problem. also it can cause depression and lack of energy, which could also make it so you never really have any motivation to try new things or anything. again, that wasnt a problem for me.
the only thing that i can say will definitely happen is your face will hurt a lot. your lips will be ridiculously chapped, and will probably bleed at times. you should get some good chapstick (not just like regular stick stuff, ask your dermatologist about any they recommend or use like vasoline or something). also get something like a yowie or a rime face tube. a thin polyester/spandex blend face tube will protect your skin from any wind or sun and things hitting it that will agitate it, while still wicking sweat that can cause more acne to form, and it wont be too hot (baically like a second skin). and your face will hurt less at the end of the day.
hope that helps