Thumb hypermobility is when a person’s thumb joint has an unusually large range of movement. Some people may experience mild to severe joint pain and require treatment. Share on Pinterest Ivan ...

Give yourself a thumbs-up, then take a closer look. If your thumb’s tip extends back toward your knuckle more than 50 degrees, you may have hitchhiker’s thumb. The nickname replaces its more technical ...

When you give a thumbs-up and notice your digit bends backward at an unusually dramatic angle, you’re witnessing what medical professionals call “distal hyperextensibility” — though most people know ...