Why Some People Have Extra Thumbs on One Hand? Causes and Common Problems Explained
Seeing someone with two thumbs on one hand may spark curiosity, but it is a natural medical condition, not a mystery.
Seeing someone with two thumbs on one hand may spark curiosity, but it is a natural medical condition, not a mystery.
Some individuals are born with six fingers due to polydactyly, a developmental error in the formation of the limbs during pregnancy.