How do I know if have joint hypermobility?

Beighton scale. If pain is present in the setting of hypermobility, most physicians will utilize the Brighton Criteria for diagnosis of JHS. If an individual has no pain then a Beighton score = or > 5/6 is sufficient for hypermobility alone.
Fingers bend back. Hypermobility is diagnosed when several joints extend ( move backwards ) more than they should, elbows small knucles and knees are common. It is not serious generally, and found in many gymnasts and indian rubber circus people.