I've been worried about my older sister. She's 22 and she's really skinny and she's always been that way, but because of college and moving a lot for internships she hasn't seen the doctor in over two years, if not more. Same with the dentist. She's 5 ft 3 and a 00 bearly weighs 100 pounds. I mean honestly, she looks healthy to me but I'm no doctor, and besides looks can be deceiving. Or she could have a issue on the inside.. Something that we can't  see. She just needs a checkup. So that's why I'm worried about her. Am I over reacting?