How Rare Is It to Be Double Jointed?

Hypermobility (more commonly called being double-jointed) affects about 20% of people.

How common is double-jointed?

Joint hypermobility, which affects approximately 20 percent of the population, confers an unusually large range of motion. Hypermobile people can often, for instance, touch their thumb to their inner forearm or place their hands flat on the floor without bending their knees.

Is it normal to be double-jointed?

“Hypermobility” means that there is a wider range of motion in a joint than is typical. Sometimes, these conditions are symptoms of whole-body syndromes affecting the collagen or connective tissue. But if the only noticeable symptoms is increased flexibility, it's generally just a normal variation.