Hi, I saw a doctor at the pain clinic for costochondritis yesterday, and asked her if she believed if it could possibly be linked with hypermobility as I have both, then she asked what level I m at as there are apparently four levels, and I said I didn t know, as although my joints are, I feel that I am inside, like with my ribs often popping out as does it feel like other things do especially when I stretch, what do you think?