What is it, what are the symptoms? Does it go hand in hand with Rheumatoid Arthritis? My Dad had awful RA and I am extremely flexible and from posts on here understand that this can be a symptom, my knees are particularly bad in cold weather and this week have begun to ache and bend back on themselves as I walk. Could this be sign of something more sinister, it had happened before but I had never heard of hypermobility. Should I exposes my concerns to my GP? What can actually be done if this is Hypermobility? TIA.